NeXT 3.3 can handle -O3 (3.0 can't).

Configure

@@ -183,9 +183,8 @@ 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",
-# 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:<libc.h>:(unknown)::BN_LLONG $x86_gcc_des ${x86_gcc_opts}:::",
+"nextstep3.3",	"cc:-O3 -Wall:<libc.h>:(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}:::",
 

TABLE

@@ -1156,6 +1156,23 @@ $rc4_obj      =
 $rmd160_obj   = 
 $rc5_obj      = 
 
+*** nextstep3.3
+$cc           = cc
+$cflags       = -O3 -Wall
+$unistd       = <libc.h>
+$thread_cflag = (unknown)
+$lflags       = 
+$bn_ops       = BN_LLONG DES_PTR DES_RISC1 DES_UNROLL RC4_INDEX MD2_INT
+$bn_obj       = 
+$des_obj      = 
+$bf_obj       = 
+$md5_obj      = 
+$sha1_obj     = 
+$cast_obj     = 
+$rc4_obj      = 
+$rmd160_obj   = 
+$rc5_obj      = 
+
 *** purify
 $cc           = purify gcc
 $cflags       = -g -DPURIFY -Wall