diff -ur php7-source.orig/build/php.m4 php7-source/build/php.m4

--- php7-source.orig/build/php.m4	2020-07-21 10:02:01.925072380 +0300

+++ php7-source/build/php.m4	2020-07-21 10:05:21.048991041 +0300

@@ -1523,18 +1523,18 @@

 dnl Wrapper for AC_CHECK_LIB.

 dnl

 AC_DEFUN([PHP_CHECK_LIBRARY], [

-  save_old_LDFLAGS=$LDFLAGS

+  save_old_LDLIBS=$LDLIBS

   ac_stuff="$5"

   save_ext_shared=$ext_shared

   ext_shared=yes

-  PHP_EVAL_LIBLINE([$]ac_stuff, LDFLAGS)

+  PHP_EVAL_LIBLINE([$]ac_stuff, LDLIBS)

   AC_CHECK_LIB([$1],[$2],[

-    LDFLAGS=$save_old_LDFLAGS

+    LDLIBS=$save_old_LDLIBS

     ext_shared=$save_ext_shared

     $3

   ],[

-    LDFLAGS=$save_old_LDFLAGS

+    LDLIBS=$save_old_LDLIBS

     ext_shared=$save_ext_shared

     unset ac_cv_lib_$1[]_$2

     $4

Только в php7-source/build: php.m4~