Using the php rpm from RH7 and recomliling on RH6.x produces
the following configure error

checking whether to include GNU gettext support... yes
checking for bindtextdomain in -lintl... no
checking for bindtextdomain in -lc... no
configure: error: Unable to find required gettext library

Where gettext IS there.
./configure ...  --with-db2 and --with-db3 ... is used, but
db2 and db3 are not installed on the system

earlier in configure output
...
checking for db_create in -ldb... no
checking for db_create in -ldb-3... no
...

They are not found,  But -l gets added the $LIBS

After much testing this is a fix.

--- aclocal.m4.pricegrabber     Fri Dec 15 15:48:32 2000
+++ aclocal.m4  Fri Dec 15 15:47:56 2000
@@ -557,7 +557,7 @@
 dnl
 AC_DEFUN(AC_ADD_LIBRARY,[
  case "$1" in
- c|c_r|pthread*) ;;
+ c|c_r|pthread*|'') ;;
  *)
 ifelse($3,,[
    PHP_X_ADD_LIBRARY($1,$2,LIBS)




What happens is the case statment will fall through if the
tests are false.  IT falls through with an empty $THIS_LIBS
variable

--from configure
 case "$THIS_LIBS" in
 c|c_r|pthread*) ;;
 *)


  LIBS="-l$THIS_LIBS $LIBS"


  ;;
  esac

---end from

if LIBS=-lfoo -lbar

when $THIS_LIBS is empty you end up with

  LIBS="-l -lfoo -lbar"

the next compile test tries to use these libraries
i.e.

configure:16753: checking for bindtextdomain in -lc
configure:16772: gcc -o conftest -O2 -march=i686 -fPIC
-L/usr/lib conftest.c -lc  -lttf -ljpeg -lgd -l -ldb -lgdbm
-lresolv -lm -ldl -lcrypt -lnsl -lttf -lpng -ljpeg -lz
-lresolv -L/usr/lib -ljpeg 1>&5

/usr/bin/ld: cannot open -l-ldb: No such file or directory


-lgd -l -ldb -lgdbm
ends up
-lgd -l-ldb -lgdbm


The solution is for the case statement to handle a NULL or
empty case

case ...

c|c_r|pthread*|'') ;;

This IMHO, is a nasty bug and took me several hours to find.


p.s.  I like getting my name in READMEs and CHANGELOGS

:)