undefined references

This question may not be php4.0.3p1-specific, but I haven't found the answer elsewhere, so here goes: The system is RH6.2 i386. The debug.log is shown below. What gives? @ ava:php-4.0.3pl1$;more debug.log CONFIGURE: './configure' '--with-apxs=/usr/local/bin/apxs' '--enable-versionin g' '--enable-track-vars' '--with-gd' '--with-mm=/usr/local' '--en able-ftp' CC: gcc CFLAGS: -g -O2 CPPFLAGS: -DEAPI CXX: CXXFLAGS: INCLUDES: -I/usr/local/include -I$(top_builddir)/Zend -I$(top_srcdir) -I/usr /include/freetype -I/usr/local/src/www/php-4.0.3pl1/ext/mysql/libmysql LDFLAGS: -Wl,-rpath,/usr/local/lib -L/usr/local/lib LIBS: -lmm -lttf -lgd -lresolv -lm -ldl -lcrypt -lnsl -lresolv DLIBS: SAPI: apache PHP_RPATHS: /usr/local/lib uname -a: Linux avalon 2.2.14-5.0 #1 Tue Mar 7 20:53:41 EST 2000 i586 unknown gcc -o conftest -g -O2 -DEAPI -Wl,-rpath,/usr/local/lib -L/usr/local/lib conft est.c -lmm -lttf -lgd -lresolv -lm -ldl -lcrypt -lnsl -lresolv 1>&5 /usr/bin/../lib/libttf.so: undefined reference to `free@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `strchr@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `_IO_getc@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `__dcgettext@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `realloc@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `fgets@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `strncpy@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `calloc@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `fread@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `___brk_addr@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `strncmp@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `fputc@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `close@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `memset@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `qsort@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `sscanf@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `memcpy@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `atexit@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `open@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `__strtol_internal@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `malloc@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `__curbrk@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `_IO_putc@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `__environ@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `munmap@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `fprintf@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `__fxstat@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `stderr@GLIBC_2.0' /usr/bin/../lib/libgd.so: undefined reference to `fwrite@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `memmove@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `_nl_msg_cat_cntr@GLIBC_2.0' /usr/bin/../lib/libttf.so: undefined reference to `mmap@GLIBC_2.0' collect2: ld returned 1 exit status