2 # Contributions by (in alphabetical order) Alan Burlison, Andy Dougherty,
3 # Dean Roehrich, Jarkko Hietaniemi, Lupe Christoph, Richard Soderberg and
6 # See README.solaris for additional information.
8 # For consistency with gcc, we do not adopt Sun Marketing's
9 # removal of the '2.' prefix from the Solaris version number.
10 # (Configure tries to detect an old fixincludes and needs
13 # If perl fails tests that involve dynamic loading of extensions, and
14 # you are using gcc, be sure that you are NOT using GNU as and ld. One
15 # way to do that is to invoke Configure with
17 # sh Configure -Dcc='gcc -B/usr/ccs/bin/'
19 # (Note that the trailing slash is *required*.)
20 # gcc will occasionally emit warnings about "unused prefix", but
21 # these ought to be harmless. See below for more details.
23 # Solaris has secure SUID scripts
24 d_suidsafe=${d_suidsafe:-define}
26 # Be paranoid about nm failing to find symbols
27 mistrustnm=${mistrustnm:-run}
29 # Several people reported problems with perl's malloc, especially
30 # when use64bitall is defined or when using gcc.
31 # http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2001-01/msg01318.html
32 # http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2001-01/msg00465.html
33 usemymalloc=${usemymalloc:-false}
36 case "$usemallocwrap" in
37 '') usemallocwrap='define' ;;
40 # Avoid all libraries in /usr/ucblib.
41 # /lib is just a symlink to /usr/lib
42 set `echo $glibpth | sed -e 's@/usr/ucblib@@' -e 's@ /lib @ @'`
45 # Starting with Solaris 10, we don't want versioned shared libraries because
46 # those often indicate a private use only library. Especially badly that would
47 # break things with SUNWbdb (Berkeley DB) being installed, which brings in
48 # /usr/lib/libdb.so.1, but that is not really meant for public consumption.
49 # XXX Revisit after perl 5.10 -- should we apply this to older Solaris
50 # versions too? (A.D. 11/2007).
51 case "`$run uname -r`" in
53 *) ignore_versioned_solibs=y ;;
56 # Remove unwanted libraries. -lucb contains incompatible routines.
57 # -lld and -lsec don't do anything useful. -lcrypt does not
58 # really provide anything we need over -lc, so we drop it, too.
59 # -lmalloc can cause a problem with GNU CC & Solaris. Specifically,
60 # libmalloc.a may allocate memory that is only 4 byte aligned, but
61 # GNU CC on the Sparc assumes that doubles are 8 byte aligned.
62 # Thanks to Hallvard B. Furuseth <h.b.furuseth@usit.uio.no>
63 set `echo " $libswanted " | sed -e 's@ ld @ @' -e 's@ malloc @ @' -e 's@ ucb @ @' -e 's@ sec @ @' -e 's@ crypt @ @'`
66 # Look for architecture name. We want to suggest a useful default.
69 if test -f /usr/bin/arch; then
70 archname=`/usr/bin/arch`
71 archname="${archname}-${osname}"
72 elif test -f /usr/ucb/arch; then
73 archname=`/usr/ucb/arch`
74 archname="${archname}-${osname}"
80 # This extracts the library directories that will be searched by the Sun
81 # Workshop compiler, given the command-line supplied in $tryworkshopcc.
82 # Use thusly: loclibpth="`$getworkshoplibs` $loclibpth"
84 getworkshoplibs=`cat <<'END'
85 eval $tryworkshopcc -### 2>&1 | \
86 sed -n '/ -Y /s!.* -Y "P,\([^"]*\)".*!\1!p' | tr ':' ' ' | \
87 sed -e 's!/usr/lib/sparcv9!!' -e 's!/usr/ccs/lib/sparcv9!!' \
88 -e 's!/usr/lib!!g' -e 's!/usr/ccs/lib!!g'
93 '') if test -f /opt/SUNWspro/bin/cc; then
94 cc=/opt/SUNWspro/bin/cc
97 You specified no cc but you seem to have the Workshop compiler
98 ($cc) installed, using that.
99 If you want something else, specify that in the command line,
100 e.g. Configure -Dcc=gcc
107 ######################################################
108 # General sanity testing. See below for excerpts from the Solaris FAQ.
110 # From roehrich@ironwood-fddi.cray.com Wed Sep 27 12:51:46 1995
111 # Date: Thu, 7 Sep 1995 16:31:40 -0500
112 # From: Dean Roehrich <roehrich@ironwood-fddi.cray.com>
113 # To: perl5-porters@africa.nicoh.com
114 # Subject: Re: On perl5/solaris/gcc
116 # Here's another draft of the perl5/solaris/gcc sanity-checker.
118 case `type ${cc:-cc}` in
119 */usr/ucb/cc*) cat <<END >&4
121 NOTE: Some people have reported problems with /usr/ucb/cc.
122 If you have difficulties, please make sure the directory
123 containing your C compiler is before /usr/ucb in your PATH.
130 # Check that /dev/fd is mounted. If it is not mounted, let the
131 # user know that suid scripts may not work.
132 $run mount | grep '^/dev/fd ' 2>&1 > /dev/null
138 NOTE: Your system does not have /dev/fd mounted. If you want to
139 be able to use set-uid scripts you must ask your system administrator
147 # See if libucb can be found in /usr/lib. If it is, warn the user
148 # that this may cause problems while building Perl extensions.
151 '') /usr/bin/ls /usr/lib/libucb* >/dev/null 2>&1
154 *) $run /usr/bin/ls '/usr/lib/libucb*' >/dev/null 2>&1
159 case $found_libucb in
163 NOTE: libucb has been found in /usr/lib. libucb should reside in
164 /usr/ucblib. You may have trouble while building Perl extensions.
170 # Use shell built-in 'type' command instead of /usr/bin/which to
171 # avoid possible csh start-up problems and also to use the same shell
172 # we'll be using to Configure and make perl.
173 # The path name is the last field in the output, but the type command
174 # has an annoying array of possible outputs, e.g.:
175 # make is hashed (/opt/gnu/bin/make)
178 # use a command like type make | awk '{print $NF}' | sed 's/[()]//g'
180 # See if make(1) is GNU make(1).
181 # If it is, make sure the setgid bit is not set.
182 make -v > make.vers 2>&1
183 if grep GNU make.vers > /dev/null 2>&1; then
184 tmp=`type make | awk '{print $NF}' | sed 's/[()]//g'`
185 case "`${ls:-'/usr/bin/ls'} -lL $tmp`" in
189 NOTE: Your PATH points to GNU make, and your GNU make has the set-group-id
190 bit set. You must either rearrange your PATH to put /usr/ccs/bin before the
191 GNU utilities or you must ask your system administrator to disable the
192 set-group-id bit on GNU make.
200 cat > UU/cc.cbu <<'EOCBU'
201 # This script UU/cc.cbu will get 'called-back' by Configure after it
202 # has prompted the user for the C compiler to use.
204 # If the C compiler is gcc:
205 # - check the fixed-includes
206 # - check as(1) and ld(1), they should not be GNU
207 # (GNU as and ld 2.8.1 and later are reportedly ok, however.)
208 # If the C compiler is not gcc:
209 # - Check if it is the Workshop/Forte compiler.
210 # If it is, prepare for 64 bit and long doubles.
211 # - check as(1) and ld(1), they should not be GNU
212 # (GNU as and ld 2.8.1 and later are reportedly ok, however.)
214 # Watch out in case they have not set $cc.
216 # Perl compiled with some combinations of GNU as and ld may not
217 # be able to perform dynamic loading of extensions. If you have a
218 # problem with dynamic loading, be sure that you are using the Solaris
219 # /usr/ccs/bin/as and /usr/ccs/bin/ld. You can do that with
220 # sh Configure -Dcc='gcc -B/usr/ccs/bin/'
221 # (note the trailing slash is required).
222 # Combinations that are known to work with the following hints:
224 # gcc-2.7.2, GNU as 2.7, GNU ld 2.7
225 # egcs-1.0.3, GNU as 2.9.1 and GNU ld 2.9.1
226 # --Andy Dougherty <doughera@lafayette.edu>
227 # Tue Apr 13 17:19:43 EDT 1999
229 # Get gcc to share its secrets.
230 echo 'int main() { return 0; }' > try.c
231 # Indent to avoid propagation to config.sh
232 verbose=`${cc:-cc} $ccflags -v -o try try.c 2>&1`
234 # XXX TODO: 'specs' output changed from 'Reading specs from' in gcc-[23] to 'Using
235 # built-in specs' in gcc-4. Perhaps we should just use the same gcc test as
236 # in Configure to see if we're using gcc.
237 if echo "$verbose" | egrep '(Reading specs from)|(Using built-in specs)' >/dev/null 2>&1; then
243 # See if as(1) is GNU as(1). GNU as(1) might not work for this job.
244 if echo "$verbose" | grep ' /usr/ccs/bin/as ' >/dev/null 2>&1; then
249 NOTE: You are using GNU as(1). GNU as(1) might not build Perl. If you
250 have trouble, you can use /usr/ccs/bin/as by including -B/usr/ccs/bin/
251 in your ${cc:-cc} command. (Note that the trailing "/" is required.)
254 # Apparently not needed, at least for as 2.7 and later.
255 # cc="${cc:-cc} $ccflags -B/usr/ccs/bin/"
258 # See if ld(1) is GNU ld(1). GNU ld(1) might not work for this job.
259 # Recompute $verbose since we may have just changed $cc.
260 verbose=`${cc:-cc} $ccflags -v -o try try.c 2>&1 | grep ld 2>&1`
262 if echo "$verbose" | grep ' /usr/ccs/bin/ld ' >/dev/null 2>&1; then
263 # Ok, gcc directly calls the Solaris /usr/ccs/bin/ld.
265 elif echo "$verbose" | grep "ld: Software Generation Utilities" >/dev/null 2>&1; then
266 # Hmm. gcc doesn't call /usr/ccs/bin/ld directly, but it
267 # does appear to be using it eventually. egcs-1.0.3's ld
269 # Most Solaris versions of ld I've seen contain the magic
270 # string used in the grep.
272 elif echo "$verbose" | grep "Solaris Link Editors" >/dev/null 2>&1; then
273 # However some Solaris 8 versions prior to ld 5.8-1.286 contain
274 # this string instead.
277 # No evidence yet of /usr/ccs/bin/ld. Some versions
278 # of egcs's ld wrapper call /usr/ccs/bin/ld in turn but
279 # apparently don't reveal that unless you pass in -V.
280 # (This may all depend on local configurations too.)
282 # Recompute verbose with -Wl,-v to find GNU ld if present
283 verbose=`${cc:-cc} $ccflags -Wl,-v -o try try.c 2>&1 | grep /ld 2>&1`
285 myld=`echo $verbose | awk '/\/ld/ {print $1}'`
286 # This assumes that gcc's output will not change, and that
287 # /full/path/to/ld will be the first word of the output.
288 # Thus myld is something like /opt/gnu/sparc-sun-solaris2.5/bin/ld
290 # Allow that $myld may be '', due to changes in gcc's output
291 if ${myld:-ld} -V 2>&1 |
292 grep "ld: Software Generation Utilities" >/dev/null 2>&1; then
293 # Ok, /usr/ccs/bin/ld eventually does get called.
295 elif ${myld:-ld} -V 2>&1 |
296 grep "Solaris Link Editors" >/dev/null 2>&1; then
297 # Ok, /usr/ccs/bin/ld eventually does get called.
300 echo "Found GNU ld='$myld'" >&4
303 NOTE: You are using GNU ld(1). GNU ld(1) might not build Perl. If you
304 have trouble, you can use /usr/ccs/bin/ld by including -B/usr/ccs/bin/
305 in your ${cc:-cc} command. (Note that the trailing "/" is required.)
307 I will try to use GNU ld by passing in the -Wl,-E flag, but if that
308 doesn't work, you should use -B/usr/ccs/bin/ instead.
311 ccdlflags="$ccdlflags -Wl,-E"
312 lddlflags="$lddlflags -Wl,-E -shared"
323 #if defined(__SUNPRO_C)
324 printf("workshop\n");
326 #if defined(__SUNPRO_CC)
327 printf("workshop CC\n");
335 tryworkshopcc="${cc:-cc} $ccflags try.c -o try"
336 if $tryworkshopcc >/dev/null 2>&1; then
338 if test "$cc_name" = "workshop"; then
339 ccversion="`${cc:-cc} -V 2>&1|sed -n -e '1s/^[Cc][Cc]: //p'`"
341 if test "$cc_name" = "workshop CC"; then
342 ccversion="`${cc:-CC} -V 2>&1|sed -n -e '1s/^[Cc][C]: //p'`"
346 # Settings for either cc or CC
347 if test ! "$use64bitall_done"; then
348 loclibpth="/usr/lib /usr/ccs/lib `$getworkshoplibs` $loclibpth"
350 # Sun CC/cc don't support gcc attributes
351 d_attribute_format='undef'
352 d_attribute_malloc='undef'
353 d_attribute_nonnull='undef'
354 d_attribute_noreturn='undef'
355 d_attribute_pure='undef'
356 d_attribute_unused='undef'
357 d_attribute_warn_unused_result='undef'
362 # See if as(1) is GNU as(1). GNU might not work for this job.
363 case `as --version < /dev/null 2>&1` in
367 NOTE: You are using GNU as(1). GNU as(1) might not build Perl.
368 You must arrange to use /usr/ccs/bin/as, perhaps by adding /usr/ccs/bin
369 to the beginning of your PATH.
375 # See if ld(1) is GNU ld(1). GNU ld(1) might not work for this job.
376 # ld --version doesn't properly report itself as a GNU tool,
377 # as of ld version 2.6, so we need to be more strict. TWP 9/5/96
378 # Sun's ld always emits the "Software Generation Utilities" string.
379 if ld -V 2>&1 | grep "ld: Software Generation Utilities" >/dev/null 2>&1; then
380 # Ok, ld is /usr/ccs/bin/ld.
385 NOTE: You are apparently using GNU ld(1). GNU ld(1) might not build Perl.
386 You should arrange to use /usr/ccs/bin/ld, perhaps by adding /usr/ccs/bin
387 to the beginning of your PATH.
393 # as --version or ld --version might dump core.
397 cat > UU/usethreads.cbu <<'EOCBU'
398 # This script UU/usethreads.cbu will get 'called-back' by Configure
399 # after it has prompted the user for whether to use threads.
400 case "$usethreads" in
402 ccflags="-D_REENTRANT $ccflags"
404 # -lpthread overrides some lib C functions, so put it before c.
405 set `echo X "$libswanted "| sed -e "s/ c / pthread c /"`
409 # sched_yield is available in the -lrt library. However,
410 # we can also pick up the equivalent yield() function in the
411 # normal C library. To avoid pulling in unnecessary
412 # libraries, we'll normally avoid sched_yield()/-lrt and
413 # just use yield(). However, we'll honor a command-line
414 # override : "-Dsched_yield=sched_yield".
415 # If we end up using sched_yield, we're going to need -lrt.
416 sched_yield=${sched_yield:-yield}
417 if test "$sched_yield" = "sched_yield"; then
418 set `echo X "$libswanted "| sed -e "s/ pthread / rt pthread /"`
423 # On Solaris 2.6 x86 there is a bug with sigsetjmp() and siglongjmp()
424 # when linked with the threads library, such that whatever positive
425 # value you pass to siglongjmp(), sigsetjmp() returns 1.
426 # Thanks to Simon Parsons <S.Parsons@ftel.co.uk> for this report.
427 # Sun BugID is 4117946, "sigsetjmp always returns 1 when called by
428 # siglongjmp in a MT program". As of 19980622, there is no patch
431 /* Test for sig(set|long)jmp bug. */
439 ret = sigsetjmp(env, 1);
440 if (ret) { return ret == 2; }
444 if test "`arch`" = i86pc -a `uname -r` = 5.6 && \
445 ${cc:-cc} try.c -lpthread >/dev/null 2>&1 && ./a.out; then
449 # These prototypes should be visible since we using
450 # -D_REENTRANT, but that does not seem to work.
451 # It does seem to work for getnetbyaddr_r, weirdly enough,
452 # and other _r functions. (Solaris 8)
454 d_ctermid_r_proto="$define"
455 d_gethostbyaddr_r_proto="$define"
456 d_gethostbyname_r_proto="$define"
457 d_getnetbyname_r_proto="$define"
458 d_getprotobyname_r_proto="$define"
459 d_getprotobynumber_r_proto="$define"
460 d_getservbyname_r_proto="$define"
461 d_getservbyport_r_proto="$define"
464 d_readdir_r_proto="$define"
465 d_readdir64_r_proto="$define"
466 d_tmpnam_r_proto="$define"
467 d_ttyname_r_proto="$define"
473 cat > UU/uselargefiles.cbu <<'EOCBU'
474 # This script UU/uselargefiles.cbu will get 'called-back' by Configure
475 # after it has prompted the user for whether to use large files.
476 case "$uselargefiles" in
477 ''|$define|true|[yY]*)
479 # Keep these in the left margin.
480 ccflags_uselargefiles="`$run getconf LFS_CFLAGS 2>/dev/null`"
481 ldflags_uselargefiles="`$run getconf LFS_LDFLAGS 2>/dev/null`"
482 libswanted_uselargefiles="`$run getconf LFS_LIBS 2>/dev/null|sed -e 's@^-l@@' -e 's@ -l@ @g'`"
484 ccflags="$ccflags $ccflags_uselargefiles"
485 ldflags="$ldflags $ldflags_uselargefiles"
486 libswanted="$libswanted $libswanted_uselargefiles"
491 # This is truly a mess.
492 case "$usemorebits" in
493 "$define"|true|[yY]*)
494 use64bitint="$define"
495 uselongdouble="$define"
499 if test `$run uname -p` = i386; then
500 case "$use64bitint" in
501 "$define"|true|[yY]*)
502 ccflags="$ccflags -DPTR_IS_LONG"
507 if test `$run uname -p` = sparc -o `$run uname -p` = i386; then
508 cat > UU/use64bitint.cbu <<'EOCBU'
509 # This script UU/use64bitint.cbu will get 'called-back' by Configure
510 # after it has prompted the user for whether to use 64 bit integers.
511 case "$use64bitint" in
512 "$define"|true|[yY]*)
513 case "`$run uname -r`" in
516 Solaris `uname -r|sed -e 's/^5\./2./'` does not support 64-bit integers.
517 You should upgrade to at least Solaris 2.5.
523 # gcc-2.8.1 on Solaris 8 with -Duse64bitint fails op/pat.t test 822
524 # if we compile regexec.c with -O. Turn off optimization for that one
525 # file. See hints/README.hints , especially
526 # =head2 Propagating variables to config.sh, method 3.
527 # A. Dougherty May 24, 2002
528 case "${gccversion}-${optimize}" in
530 # Honor a command-line override (rather unlikely)
531 case "$regexec_cflags" in
532 '') echo "Disabling optimization on regexec.c for gcc $gccversion" >&4
533 regexec_cflags='optimize='
534 echo "regexec_cflags='optimize=\"\"'" >> config.sh
543 cat > UU/use64bitall.cbu <<'EOCBU'
544 # This script UU/use64bitall.cbu will get 'called-back' by Configure
545 # after it has prompted the user for whether to be maximally 64 bitty.
546 case "$use64bitall-$use64bitall_done" in
547 "$define-"|true-|[yY]*-)
548 case "`$run uname -r`" in
551 Solaris `uname -r|sed -e 's/^5\./2./'` does not support 64-bit pointers.
552 You should upgrade to at least Solaris 2.7.
557 processor=`$run uname -p`;
558 if test "$processor" = sparc; then
559 libc='/usr/lib/sparcv9/libc.so'
560 if test ! -f $libc; then
563 I do not see the 64-bit libc, $libc.
564 Cannot continue, aborting.
570 case "${cc:-cc} -v 2>/dev/null" in
572 echo 'int main() { return 0; }' > try.c
573 case "`${cc:-cc} $ccflags -mcpu=v9 -m64 -S try.c 2>&1 | grep 'm64 is not supported by this configuration'`" in
574 *"m64 is not supported"*)
577 Full 64-bit build is not supported by this gcc configuration.
578 Check http://gcc.gnu.org/ for the latest news of availability
579 of gcc for 64-bit Sparc.
581 Cannot continue, aborting.
587 if test "$processor" = sparc; then
588 loclibpth="/usr/lib/sparcv9 $loclibpth"
589 ccflags="$ccflags -mcpu=v9"
591 ccflags="$ccflags -m64"
593 # This adds in -Wa,-xarch=v9. I suspect that's superfluous,
594 # since the -m64 above should do that already. Someone
595 # with gcc-3.x.x, please test with gcc -v. A.D. 20-Nov-2003
596 # if test $processor = sparc -a X`$run getconf XBS5_LP64_OFF64_CFLAGS 2>/dev/null` != X; then
597 # ccflags="$ccflags -Wa,`$run getconf XBS5_LP64_OFF64_CFLAGS 2>/dev/null`"
599 ldflags="$ldflags -m64"
601 # See [perl #66604]: On Solaris 11, gcc -m64 on amd64
602 # appears not to understand -G. (gcc -G has not caused
603 # problems on other platforms in the past.) gcc versions
604 # at least as old as 3.4.3 support -shared, so just
605 # use that with Solaris 11 and later, but keep
606 # the old behavior for older Solaris versions.
608 2.?|2.10) lddlflags="$lddlflags -G -m64" ;;
609 *) lddlflags="$lddlflags -shared -m64" ;;
613 getconfccflags="`$run getconf XBS5_LP64_OFF64_CFLAGS 2>/dev/null`"
614 getconfldflags="`$run getconf XBS5_LP64_OFF64_LDFLAGS 2>/dev/null`"
615 getconflddlflags="`$run getconf XBS5_LP64_OFF64_LDFLAGS 2>/dev/null`"
616 echo "int main() { return(0); } " > try.c
617 case "`${cc:-cc} $getconfccflags try.c 2>&1 | grep 'deprecated'`" in
618 *" -xarch=generic64 is deprecated, use -m64 "*)
619 getconfccflags=`echo $getconfccflags | sed -e 's/xarch=generic64/m64/'`
620 getconfldflags=`echo $getconfldflags | sed -e 's/xarch=generic64/m64/'`
621 getconflddlflags=`echo $getconflddlflags | sed -e 's/xarch=generic64/m64/'`
624 ccflags="$ccflags $getconfccflags"
625 ldflags="$ldflags $getconfldflags"
626 lddlflags="$lddlflags -G $getconflddlflags"
628 echo "int main() { return(0); } " > try.c
629 tryworkshopcc="${cc:-cc} try.c -o try $ccflags"
630 if test "$processor" = sparc; then
631 loclibpth="/usr/lib/sparcv9 /usr/ccs/lib/sparcv9 $loclibpth"
633 loclibpth="`$getworkshoplibs` $loclibpth"
643 # Actually, we want to run this already now, if so requested,
644 # because we need to fix up things right now.
645 case "$use64bitall" in
646 "$define"|true|[yY]*)
647 # CBUs expect to be run in UU
648 cd UU; . ./use64bitall.cbu; cd ..
653 cat > UU/uselongdouble.cbu <<'EOCBU'
654 # This script UU/uselongdouble.cbu will get 'called-back' by Configure
655 # after it has prompted the user for whether to use long doubles.
656 case "$uselongdouble" in
657 "$define"|true|[yY]*)
658 if test "$cc_name" = "workshop"; then
661 int main() { (void) powl(2, 256); return(0); }
663 if ${cc:-cc} try.c -lsunmath -o try > /dev/null 2>&1 && ./try; then
664 libswanted="$libswanted sunmath"
669 The Sun Workshop math library is either not available or not working,
670 so I do not know how to do long doubles, sorry.
671 I'm therefore disabling the use of long doubles.
673 uselongdouble="$undef"
680 # If unsetenv is available, use it in conjunction with PERL_USE_SAFE_PUTENV to
681 # work around Sun bugid 6333830. Both unsetenv and 6333830 only appear in
682 # Solaris 10, so we don't need to probe explicitly for an OS version. We have
683 # to append this test to the end of config.over as it needs to run after
684 # Configure has probed for unsetenv, and this hints file is processed before
687 cat >> config.over <<'EOOVER'
688 if test "$d_unsetenv" = "$define" -a \
689 `expr "$ccflags" : '.*-D_PERL_USE_SAFE_PUTENV'` -eq 0; then
690 ccflags="$ccflags -DPERL_USE_SAFE_PUTENV"
694 rm -f try.c try.o try a.out
696 # If using C++, the Configure scan for dlopen() will fail in Solaris
697 # because one of the two (1) an extern "C" linkage definition is needed
698 # (2) #include <dlfcn.h> is needed, *and* a cast to (void*(*)())
699 # is needed for the &dlopen. Adding any of these would require changing
700 # a delicate spot in Configure, so easier just to force our guess here
701 # for Solaris. Much the same goes for dlerror().