env CC=cc ./configure && make
...
/bin/sh ../libtool --silent --mode=link cc  -g  -o libZend.la  -ldb     -lpam -ldl -ldl -lresolv -lresolv -lm -lcrypt -lsocket -lnsl  -lsocket zend-parser.lo zend_alloc.lo zend_compile.lo  zend_constants.lo zend_dynamic_array.lo zend_execute.lo  zend_execute_API.lo zend_highlight.lo zend_llist.lo zend_opcode.lo  zend_operators.lo zend_ptr_stack.lo zend_stack.lo zend_variables.lo  zend.lo zend_API.lo zend_extensions.lo zend_hash.lo zend_list.lo  zend_indent.lo zend_builtin_functions.lo zend_sprintf.lo libZend_c.la 
Making all in ext
Making all in db
gcc -DHAVE_CONFIG_H -I. -I/tmp/php-4.0b4pl1/ext/db -I../.. -I../../Zend -I/tmp/php-4.0b4pl1  -I/afs/engr.wisc.edu/src/gnu/include -I/afs/engr.wisc.edu/src/free/include -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -g  -c db.c && touch db.lo
...
ild: (undefined symbol) __eprintf -- referenced in the text segment of .libs/libphp4.a(getopt.o)
*** Error code 5
make: Fatal error: Command failed for target `php'
Current working directory /tmp/php-4.0b4pl1
*** Error code 1
make: Fatal error: Command failed for target `all-recursive'

Note that __eprintf comes from assert.h from egcs.  In order to use __eprintf, one needs to link against libgcc.  Since the linking is being done with cc, not gcc, the libgcc is not linked by default, and as such the missing symbol comes about.

Fix:
*** build/ltlib.mk.orig Wed Feb 23 17:31:09 2000
--- build/ltlib.mk      Wed Feb 23 17:31:16 2000
***************
*** 30,33 ****
  include $(topsrcdir)/build/library.mk
  
  # CC = insure
! CC = gcc
--- 30,33 ----
  include $(topsrcdir)/build/library.mk
  
  # CC = insure
! # CC = gcc