Index: src/libcfa/Makefile.am
===================================================================
--- src/libcfa/Makefile.am	(revision 7895d46e255063a94fa10461515705638aeb7a34)
+++ src/libcfa/Makefile.am	(revision 27cc24ea994ee36438688fbfb87b860ee499667f)
@@ -35,5 +35,5 @@
 	 ${AM_V_GEN}@BACKEND_CC@ @CFA_FLAGS@ -D__CFA_DEBUG__ -O0 -c -o $@ $<
 
-EXTRA_FLAGS = -g -Wall -Wno-unused-function -I${abs_top_srcdir}/src/libcfa/libhdr -imacros libcfa-prelude.c @CFA_FLAGS@
+EXTRA_FLAGS = -g -Wall -Werror -Wno-unused-function -I${abs_top_srcdir}/src/libcfa/libhdr -imacros libcfa-prelude.c @CFA_FLAGS@
 
 AM_CCASFLAGS = @CFA_FLAGS@
Index: src/libcfa/Makefile.in
===================================================================
--- src/libcfa/Makefile.in	(revision 7895d46e255063a94fa10461515705638aeb7a34)
+++ src/libcfa/Makefile.in	(revision 27cc24ea994ee36438688fbfb87b860ee499667f)
@@ -305,5 +305,5 @@
 AUTOMAKE_OPTIONS = subdir-objects
 lib_LIBRARIES = $(am__append_1) $(am__append_2)
-EXTRA_FLAGS = -g -Wall -Wno-unused-function -I${abs_top_srcdir}/src/libcfa/libhdr -imacros libcfa-prelude.c @CFA_FLAGS@
+EXTRA_FLAGS = -g -Wall -Werror -Wno-unused-function -I${abs_top_srcdir}/src/libcfa/libhdr -imacros libcfa-prelude.c @CFA_FLAGS@
 AM_CCASFLAGS = @CFA_FLAGS@
 headers = limits stdlib math iostream fstream iterator rational assert \