diff --git a/TSRM/tsrm.m4 b/TSRM/tsrm.m4
index 9eabca30add73..84f67f3f1f2ee 100644
--- a/TSRM/tsrm.m4
+++ b/TSRM/tsrm.m4
@@ -4,7 +4,6 @@ AC_DEFUN([TSRM_BASIC_CHECKS],[
 
 AC_REQUIRE([AC_PROG_CC])dnl
 dnl AC_REQUIRE([AM_PROG_CC_STDC])dnl
-AC_REQUIRE([AC_PROG_CC_C_O])dnl
 AC_REQUIRE([AC_PROG_RANLIB])dnl
 
 AC_CHECK_FUNCS(sigprocmask)
diff --git a/Zend/Zend.m4 b/Zend/Zend.m4
index 25105b14510de..31c59b9ed7a91 100644
--- a/Zend/Zend.m4
+++ b/Zend/Zend.m4
@@ -6,7 +6,6 @@ AC_DEFUN([LIBZEND_BASIC_CHECKS],[
 
 AC_REQUIRE([AC_PROG_YACC])
 AC_REQUIRE([AC_PROG_CC])
-AC_REQUIRE([AC_PROG_CC_C_O])
 
 LIBZEND_BISON_CHECK
 
diff --git a/configure.ac b/configure.ac
index 45845cdde5d7f..6b0a24addc8f9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -176,7 +176,6 @@ PKG_PROG_PKG_CONFIG
 AC_PROG_CC([cc gcc])
 PHP_DETECT_ICC
 PHP_DETECT_SUNCC
-AC_PROG_CC_C_O
 dnl Change to AC_PROG_CC_STDC when we start requiring a post-2.13 autoconf
 dnl AC_PROG_CC_STDC
 AC_PROG_CPP
diff --git a/scripts/phpize.m4 b/scripts/phpize.m4
index cb6934541a6b7..6af13982cd316 100644
--- a/scripts/phpize.m4
+++ b/scripts/phpize.m4
@@ -26,7 +26,6 @@ abs_builddir=`pwd`
 AC_PROG_CC([cc gcc])
 PHP_DETECT_ICC
 PHP_DETECT_SUNCC
-AC_PROG_CC_C_O
 
 dnl Support systems with system libraries in e.g. /usr/lib64
 PHP_ARG_WITH(libdir, for system library directory,