diff --git a/lib/libdvbsub/Makefile.am b/lib/libdvbsub/Makefile.am
index 6ac627d08..aa9082181 100644
--- a/lib/libdvbsub/Makefile.am
+++ b/lib/libdvbsub/Makefile.am
@@ -4,6 +4,7 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/src \
 	-I$(top_srcdir)/src/zapit/include \
 	@AVFORMAT_CFLAGS@ \
+	@SIGC_CFLAGS@ \
 	@HWLIB_CFLAGS@
 
 AM_CPPFLAGS += -fno-rtti -fno-exceptions
diff --git a/lib/libtuxtxt/Makefile.am b/lib/libtuxtxt/Makefile.am
index 7ea232ad1..5d24e483e 100644
--- a/lib/libtuxtxt/Makefile.am
+++ b/lib/libtuxtxt/Makefile.am
@@ -4,6 +4,7 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/src \
 	-I$(top_srcdir)/src/zapit/include \
 	$(FREETYPE_CFLAGS) \
+	@SIGC_CFLAGS@ \
 	@HWLIB_CFLAGS@
 
 AM_CPPFLAGS += -fno-rtti -fno-exceptions
diff --git a/src/zapit/src/Makefile.am b/src/zapit/src/Makefile.am
index a1dac17bc..0130f3a8a 100644
--- a/src/zapit/src/Makefile.am
+++ b/src/zapit/src/Makefile.am
@@ -11,6 +11,7 @@ AM_CPPFLAGS += \
 	-I$(top_srcdir)/lib/libeventserver \
 	-I$(top_srcdir)/lib/xmltree \
 	@FREETYPE_CFLAGS@ \
+	@SIGC_CFLAGS@ \
 	@HWLIB_CFLAGS@
 
 noinst_LIBRARIES = libzapit.a