Use only -O, not -O3 for NeXTstep:

> The nextstep port uses the -O3 switch to gcc.  Support for -O3 didn't appear
> until later (and buggier) versions of NeXTstep.  Use -O instead, or have a
> separate port.

Submitted by: Mark Crispin <MRC@Panda.COM>

Configure

@@ -182,7 +182,9 @@ my %table=(
 "FreeBSD-elf",  "gcc:-DTERMIOS -DL_ENDIAN -fomit-frame-pointer -O3 -m486 -Wall:(unknown)::BN_LLONG $x86_gcc_des $x86_gcc_opts:$x86_elf_asm",
 "bsdi-gcc",     "gcc:-O3 -ffast-math -DL_ENDIAN -DPERL5 -m486:(unknown)::RSA_LLONG $x86_gcc_des $x86_gcc_opts:$x86_bsdi_asm",
 "bsdi-elf-gcc",     "gcc:-DPERL5 -DL_ENDIAN -fomit-frame-pointer -O3 -m486 -Wall:(unknown)::BN_LLONG $x86_gcc_des $x86_gcc_opts:$x86_elf_asm",
-"nextstep",	"cc:-O3 -Wall:(unknown)::BN_LLONG $x86_gcc_des ${x86_gcc_opts}:::",
+# Mark Crispin advises against using -O3 on NeXTstep ...
+# "nextstep",	"cc:-O3 -Wall:(unknown)::BN_LLONG $x86_gcc_des ${x86_gcc_opts}:::",
+"nextstep",	"cc:-O -Wall:(unknown)::BN_LLONG $x86_gcc_des ${x86_gcc_opts}:::",
 # NCR MP-RAS UNIX ver 02.03.01
 "ncr-scde","cc:-O6 -Xa -Hoff=BEHAVED -686 -Hwide -Hiw:(unknown):-lsocket -lnsl:$x86_gcc_des ${x86_gcc_opts}:::",