buildworld fails in gdb

cc -O -pipe -march=pentium4 -D_GNU_SOURCE -I. 
-I/usr/src/gnu/usr.bin/binutils/gdb 
-I/usr/src/gnu/usr.bin/binutils/gdb/../libbfd/i386 
-I/usr/src/gnu/usr.bin/binutils/gdb/../../../../contrib/binutils/include 
-Dprint_insn_i386=print_insn_i386_att 
-DDEFAULT_BFD_VEC=bfd_elf32_i386_freebsd_vec -DGDB_XM_FILE 
-Dprint_insn_i386=print_insn_i386_att 
-DDEFAULT_BFD_VEC=bfd_elf32_i386_freebsd_vec -DGDB_XM_FILE 
-DDEFAULT_BFD_ARCH=bfd_i386_arch 
-I/usr/src/gnu/usr.bin/binutils/gdb/i386 
-I/usr/src/gnu/usr.bin/binutils/gdb/../../../../contrib/binutils/binutils 
-I/usr/src/gnu/usr.bin/binutils/gdb/../../../../contrib/binutils/bfd 
-I/usr/src/gnu/usr.bin/binutils/gdb/../../../../contrib/gdb/gdb 
-I/usr/src/gnu/usr.bin/binutils/gdb/../../../../contrib/gdb/gdb/config 
-I/usr/src/gnu/usr.bin/binutils/gdb/../../../../../include/gnu 
-I/usr/src/gnu/usr.bin/binutils/gdb  -c 
/usr/src/contrib/gdb/gdb/source.c
/usr/src/contrib/gdb/gdb/source.c: In function `mod_path':
/usr/src/contrib/gdb/gdb/source.c:383: warning: assignment makes pointer 
from integer without a cast
/usr/src/contrib/gdb/gdb/source.c: In function `_initialize_source':
/usr/src/contrib/gdb/gdb/source.c:1576: error: `RE_SYNTAX_GREP' 
undeclared (first use in this function)
/usr/src/contrib/gdb/gdb/source.c:1576: error: (Each undeclared 
identifier is reported only once
/usr/src/contrib/gdb/gdb/source.c:1576: error: for each function it 
appears in.)
*** Error code 1

Stop in /usr/src/gnu/usr.bin/binutils/gdb.
*** Error code 1

Stop in /usr/src/gnu/usr.bin/binutils.
*** Error code 1

Stop in /usr/src/gnu/usr.bin.
*** Error code 1

Stop in /usr/src/gnu.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.

-- 
"Without the userland, the kernel is useless."
               --inspired by The Tao of Programming