diff --git a/src/modules/Makefile.am b/src/modules/Makefile.am
index a26b75f..b5685b1 100644
--- a/src/modules/Makefile.am
+++ b/src/modules/Makefile.am
@@ -87,7 +87,7 @@ sd_ibmtts_LDFLAGS = -Wl,-rpath=/opt/IBM/ibmtts/lib
 EXTRA_sd_ibmtts_DEPENDENCIES = libibmeci.so
 
 libibmeci.so: $(srcdir)/ibmtts_shim.c
-	$(CC) -fPIC -shared $< -o $@
+	$(CC) $(CFLAGS) -fPIC -shared $< -o $@
 
 CLEANFILES += $(EXTRA_sd_ibmtts_DEPENDENCIES)
 endif
@@ -143,7 +143,7 @@ sd_baratinoo_LDADD += -L.
 EXTRA_sd_baratinoo_DEPENDENCIES = libbaratinoo.so
 
 libbaratinoo.so: $(srcdir)/baratinoo_shim.c
-	$(CC) -fPIC -shared $< -o $@
+	$(CC) $(CFLAGS) -fPIC -shared $< -o $@
 
 CLEANFILES += $(EXTRA_sd_baratinoo_DEPENDENCIES)
 endif
@@ -168,7 +168,7 @@ noinst_HEADERS = kali_shim/kali/Kali/kali.h module_utils_speak_queue.h
 EXTRA_sd_kali_DEPENDENCIES = libKali.so libKGlobal.so libKTrans.so libKParle.so libKAnalyse.so
 
 lib%.so: $(srcdir)/kali_%_shim.cpp
-	$(CXX) -fPIC -shared $< -o $@ -I$(srcdir)/kali_shim
+	$(CXX) $(CXXFLAGS) -fPIC -shared $< -o $@ -I$(srcdir)/kali_shim
 
 CLEANFILES += $(EXTRA_sd_kali_DEPENDENCIES)
 endif
@@ -191,7 +191,7 @@ sd_voxin_LDADD += -L.
 EXTRA_sd_voxin_DEPENDENCIES = libvoxin.so
 
 libvoxin.so: $(srcdir)/voxin_shim.c
-	$(CC) -fPIC -shared $< -o $@
+	$(CC) $(CFLAGS) -fPIC -shared $< -o $@
 
 CLEANFILES += $(EXTRA_sd_voxin_DEPENDENCIES)
 endif