diff --git a/configure.ac b/configure.ac
index 13dddc61..3c6df0db 100644
--- a/configure.ac
+++ b/configure.ac
@@ -350,10 +350,10 @@ if test "x$debug" = "xyes" ; then
 	GCC_STACK_PROTECT_LIB
 	GCC_STACK_PROTECT_CC
 	GCC_FORTIFY_SOURCE_CC
-	CFLAGS="$CFLAGS -g -Wall -Werror"
+	WARNING_CFLAGS="-g -Wall -Werror"
 else
 	AC_MSG_RESULT(no)
-	CFLAGS="$CFLAGS -Wall"
+	WARNING_CFLAGS="-Wall"
 fi
 
 # Enable or disable use of git version in pacman version string
@@ -424,7 +424,7 @@ ${PACKAGE_NAME}:
 
     compiler               : ${CC}
     preprocessor flags     : ${CPPFLAGS}
-    compiler flags         : ${CFLAGS}
+    compiler flags         : ${WARNING_CFLAGS} ${CFLAGS}
     defines                : ${DEFS}
     library flags          : ${LIBS} ${LIBSSL_LIBS} ${LIBARCHIVE_LIBS} ${LIBCURL_LIBS} ${GPGME_LIBS}
     linker flags           : ${LDFLAGS}
diff --git a/lib/libalpm/Makefile.am b/lib/libalpm/Makefile.am
index 31de62e3..0781d5d8 100644
--- a/lib/libalpm/Makefile.am
+++ b/lib/libalpm/Makefile.am
@@ -10,7 +10,7 @@ DEFS = -DLOCALEDIR=\"@localedir@\" @DEFS@
 AM_CPPFLAGS = \
 	-imacros $(top_builddir)/config.h
 
-AM_CFLAGS = -pedantic -D_GNU_SOURCE
+AM_CFLAGS = -pedantic -D_GNU_SOURCE $(WARNING_CFLAGS)
 
 if ENABLE_VISIBILITY_CC
 if DARWIN
diff --git a/src/pacman/Makefile.am b/src/pacman/Makefile.am
index 9a92fd6b..c8ce9773 100644
--- a/src/pacman/Makefile.am
+++ b/src/pacman/Makefile.am
@@ -21,7 +21,7 @@ AM_CPPFLAGS = \
 	-imacros $(top_builddir)/config.h \
 	-I$(top_srcdir)/lib/libalpm
 
-AM_CFLAGS = -pedantic -D_GNU_SOURCE
+AM_CFLAGS = -pedantic -D_GNU_SOURCE $(WARNING_CFLAGS)
 
 if USE_GIT_VERSION
 GIT_VERSION := $(shell sh -c 'git describe --abbrev=4 --dirty | sed s/^v//')
diff --git a/src/util/Makefile.am b/src/util/Makefile.am
index 1465407c..463abf7f 100644
--- a/src/util/Makefile.am
+++ b/src/util/Makefile.am
@@ -17,7 +17,7 @@ AM_CPPFLAGS = \
 	-imacros $(top_builddir)/config.h \
 	-I$(top_srcdir)/lib/libalpm
 
-AM_CFLAGS = -pedantic -D_GNU_SOURCE
+AM_CFLAGS = -pedantic -D_GNU_SOURCE $(WARNING_CFLAGS)
 
 cleanupdelta_SOURCES = cleanupdelta.c
 cleanupdelta_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la