diff -urN opal-3.12.4.old/plugins/plugin-inc.mak.in opal-3.12.4/plugins/plugin-inc.mak.in
--- opal-3.12.4.old/plugins/plugin-inc.mak.in	2013-06-22 21:14:01.528580888 +0200
+++ opal-3.12.4/plugins/plugin-inc.mak.in	2013-06-22 21:14:42.652579425 +0200
@@ -32,11 +32,13 @@
 CXX           := @CXX@
 INSTALL       := @INSTALL@
 CFLAGS        += @CFLAGS@ -I@prefix@/include -I$(PLUGINDIR)/../include -I$(PLUGINDIR)
+CXXFLAGS      += @CXXFLAGS@ -I@prefix@/include -I$(PLUGINDIR)/../include -I$(PLUGINDIR)
 LDFLAGS       += @LDFLAGS@ @LDSO@
 PLUGINEXT     :=@PLUGINEXT@
 
 ifneq ($(DEBUG),)
 CFLAGS        += -g
+CXXFLAGS      += -g
 endif
 
 OBJDIR := $(PLUGINDIR)/../lib_@target@/plugins/$(BASENAME)
@@ -65,11 +67,11 @@
 
 $(OBJDIR)/%.o : %.cxx
 	@mkdir -p $(OBJDIR) >/dev/null 2>&1
-	$(Q_CC)$(CXX) -c $(CXXFLAGS) $(CFLAGS) -o $@ $<
+	$(Q_CC)$(CXX) -c $(CXXFLAGS) -o $@ $<
 
 $(OBJDIR)/%.o : %.cpp
 	@mkdir -p $(OBJDIR) >/dev/null 2>&1
-	$(Q_CC)$(CXX) -c $(CXXFLAGS) $(CFLAGS) -o $@ $<
+	$(Q_CC)$(CXX) -c $(CXXFLAGS) -o $@ $<
 
 OBJECTS	= $(addprefix $(OBJDIR)/,$(patsubst %.cxx,%.o,$(patsubst %.cpp,%.o,$(patsubst %.c,%.o,$(notdir $(SRCS))))))
 
diff -urN opal-3.12.4.old/plugins/video/H.261-vic/Makefile.in opal-3.12.4/plugins/video/H.261-vic/Makefile.in
--- opal-3.12.4.old/plugins/video/H.261-vic/Makefile.in	2013-06-22 21:14:01.503580889 +0200
+++ opal-3.12.4/plugins/video/H.261-vic/Makefile.in	2013-06-22 21:14:42.652579425 +0200
@@ -39,7 +39,7 @@
              $(SRCDIR)/bv.c \
 
 
-CFLAGS += -I$(COMMONDIR)
+CXXFLAGS += -I$(COMMONDIR)
 
 INSTALL_DIR := @VC_PLUGIN_DIR@
 PLUGINDIR   := @PLUGINDIR@
diff -urN opal-3.12.4.old/plugins/video/H.263-1998/Makefile.in opal-3.12.4/plugins/video/H.263-1998/Makefile.in
--- opal-3.12.4.old/plugins/video/H.263-1998/Makefile.in	2013-06-22 21:14:01.499580889 +0200
+++ opal-3.12.4/plugins/video/H.263-1998/Makefile.in	2013-06-22 21:16:18.196576026 +0200
@@ -34,12 +34,12 @@
              $(COMMONDIR)/ffmpeg.cxx \
              $(COMMONDIR)/dyna.cxx
 
-CFLAGS += @LIBAVCODEC_CFLAGS@ -I$(COMMONDIR)
+CXXFLAGS += @LIBAVCODEC_CFLAGS@ -I$(COMMONDIR)
 LIBS   += @LIBAVCODEC_LIBS@ @LIBAVUTIL_LIBS@
 
 HAVE_LIBAVCODEC_RTP_MODE=@HAVE_LIBAVCODEC_RTP_MODE@
 ifeq ($(HAVE_LIBAVCODEC_RTP_MODE),yes)
-CFLAGS += -DLIBAVCODEC_RTP_MODE=1
+CXXFLAGS += -DLIBAVCODEC_RTP_MODE=1
 endif
 
 vpath   %.cxx $(COMMONDIR)
diff -urN opal-3.12.4.old/plugins/video/H.264/gpl/Makefile.in opal-3.12.4/plugins/video/H.264/gpl/Makefile.in
--- opal-3.12.4.old/plugins/video/H.264/gpl/Makefile.in	2013-06-22 21:14:01.500580889 +0200
+++ opal-3.12.4/plugins/video/H.264/gpl/Makefile.in	2013-06-22 21:16:35.515575410 +0200
@@ -48,7 +48,7 @@
 
 CC	 	=@CC@
 CXX	 	=@CXX@
-CFLAGS  =@X264_CFLAGS@ @LIBAVCODEC_CFLAGS@ -I.. -I$(PLUGINDIR) -I$(OPALDIR)/include -DGPL_HELPER_APP -DPLUGINCODEC_TRACING
+CXXFLAGS  =@X264_CFLAGS@ @LIBAVCODEC_CFLAGS@ -I.. -I$(PLUGINDIR) -I$(OPALDIR)/include -DGPL_HELPER_APP -DPLUGINCODEC_TRACING
 LDFLAGS = @X264_LIBS@ @LIBAVCODEC_LIBS@ @LIBAVUTIL_LIBS@ @DL_LIBS@ @LDFLAGS@
 
 
@@ -61,7 +61,7 @@
 
 $(OBJDIR)/%.o : %.cxx
 	@mkdir -p $(OBJDIR) >/dev/null 2>&1
-	$(Q_CC)$(CXX) $(CFLAGS) -c $< -o $@
+	$(Q_CC)$(CXX) $(CXXFLAGS) -c $< -o $@
 
 $(OBJDIR)/%.o : %.c
 	@mkdir -p $(OBJDIR) >/dev/null 2>&1
diff -urN opal-3.12.4.old/plugins/video/H.264/Makefile.in opal-3.12.4/plugins/video/H.264/Makefile.in
--- opal-3.12.4.old/plugins/video/H.264/Makefile.in	2013-06-22 21:14:01.500580889 +0200
+++ opal-3.12.4/plugins/video/H.264/Makefile.in	2013-06-22 21:16:52.874574792 +0200
@@ -35,12 +35,12 @@
            $(COMMONDIR)/ffmpeg.cxx \
            $(COMMONDIR)/dyna.cxx
 
-CFLAGS += @LIBAVCODEC_CFLAGS@ -I$(COMMONDIR) -DLIB_DIR='"$(libdir)"' -DVC_PLUGIN_DIR='"@VC_PLUGIN_DIR@"'
+CXXFLAGS += @LIBAVCODEC_CFLAGS@ -I$(COMMONDIR) -DLIB_DIR='"$(libdir)"' -DVC_PLUGIN_DIR='"@VC_PLUGIN_DIR@"'
 LIBS   += @LIBAVCODEC_LIBS@ @LIBAVUTIL_LIBS@
 
 IS_H264_LICENSED:=@IS_H264_LICENSED@
 ifeq ($(IS_H264_LICENSED),yes)
-  CFLAGS += @X264_CFLAGS@ -DX264_LICENSED
+  CXXFLAGS += @X264_CFLAGS@ -DX264_LICENSED
   LIBS   += @X264_LIBS@
 else
   SUBDIRS := gpl
diff -urN opal-3.12.4.old/plugins/video/MPEG4-ffmpeg/Makefile.in opal-3.12.4/plugins/video/MPEG4-ffmpeg/Makefile.in
--- opal-3.12.4.old/plugins/video/MPEG4-ffmpeg/Makefile.in	2013-06-22 21:14:01.499580889 +0200
+++ opal-3.12.4/plugins/video/MPEG4-ffmpeg/Makefile.in	2013-06-22 21:15:53.183576916 +0200
@@ -32,14 +32,14 @@
              $(COMMONDIR)/ffmpeg.cxx \
              $(COMMONDIR)/dyna.cxx
 
-CFLAGS += @LIBAVCODEC_CFLAGS@ -I$(COMMONDIR)
+CXXFLAGS += @LIBAVCODEC_CFLAGS@ -I$(COMMONDIR)
 LIBS   += @LIBAVCODEC_LIBS@ @LIBAVUTIL_LIBS@
 
 # Add LIBAVCODEC_SOURCE_DIR to the include path so we can #include <libavcodec/...h>
 # Also add libavutil, so ffmpeg headers can #include "log.h".
 LIBAVCODEC_SOURCE_DIR := @LIBAVCODEC_SOURCE_DIR@
 ifneq (,$(LIBAVCODEC_SOURCE_DIR))
-CFLAGS += -I$(LIBAVCODEC_SOURCE_DIR) -I$(LIBAVCODEC_SOURCE_DIR)/libavutil
+CXXFLAGS += -I$(LIBAVCODEC_SOURCE_DIR) -I$(LIBAVCODEC_SOURCE_DIR)/libavutil
 endif
 
 vpath   %.cxx $(COMMONDIR)
diff -urN opal-3.12.4.old/plugins/video/THEORA/Makefile.in opal-3.12.4/plugins/video/THEORA/Makefile.in
--- opal-3.12.4.old/plugins/video/THEORA/Makefile.in	2013-06-22 21:14:01.503580889 +0200
+++ opal-3.12.4/plugins/video/THEORA/Makefile.in	2013-06-22 21:14:42.654579425 +0200
@@ -30,7 +30,7 @@
 SRCDIR    := .
 SRCS      := theora_frame.cxx theora_plugin.cxx
 
-CFLAGS += @THEORA_CFLAGS@ -I$(COMMONDIR)
+CXXFLAGS += @THEORA_CFLAGS@ -I$(COMMONDIR)
 LIBS   += @THEORA_LIBS@
 
 INSTALL_DIR := @VC_PLUGIN_DIR@