diff --git a/repos/libports/lib/mk/avcodec.inc b/repos/libports/lib/mk/avcodec.inc
index 4ac24ae4f..56cb11c30 100644
--- a/repos/libports/lib/mk/avcodec.inc
+++ b/repos/libports/lib/mk/avcodec.inc
@@ -5,7 +5,7 @@ include $(REP_DIR)/lib/import/import-avcodec.mk
 LIBAV_PORT_DIR := $(call select_from_ports,libav)
 LIBAVCODEC_DIR := $(LIBAV_PORT_DIR)/src/lib/libav/libavcodec
 
-include $(LIBAVCODEC_DIR)/Makefile
+-include $(LIBAVCODEC_DIR)/Makefile
 
 LIBS += zlib
 
diff --git a/repos/libports/lib/mk/avfilter.mk b/repos/libports/lib/mk/avfilter.mk
index 063bac6fc..e12e0c6ce 100644
--- a/repos/libports/lib/mk/avfilter.mk
+++ b/repos/libports/lib/mk/avfilter.mk
@@ -4,6 +4,6 @@ include $(REP_DIR)/lib/import/import-avfilter.mk
 
 LIBAVFILTER_DIR = $(call select_from_ports,libav)/src/lib/libav/libavfilter
 
-include $(LIBAVFILTER_DIR)/Makefile
+-include $(LIBAVFILTER_DIR)/Makefile
 
 vpath % $(LIBAVFILTER_DIR)
diff --git a/repos/libports/lib/mk/avformat.mk b/repos/libports/lib/mk/avformat.mk
index e5493112d..d231f9bfd 100644
--- a/repos/libports/lib/mk/avformat.mk
+++ b/repos/libports/lib/mk/avformat.mk
@@ -4,7 +4,7 @@ include $(REP_DIR)/lib/import/import-avformat.mk
 
 LIBAVFORMAT_DIR = $(call select_from_ports,libav)/src/lib/libav/libavformat
 
-include $(LIBAVFORMAT_DIR)/Makefile
+-include $(LIBAVFORMAT_DIR)/Makefile
 
 LIBS  += avcodec avutil zlib
 
diff --git a/repos/libports/lib/mk/avresample.mk b/repos/libports/lib/mk/avresample.mk
index b6c2c388f..50e997d52 100644
--- a/repos/libports/lib/mk/avresample.mk
+++ b/repos/libports/lib/mk/avresample.mk
@@ -4,6 +4,6 @@ include $(REP_DIR)/lib/import/import-avresample.mk
 
 LIBAVRESAMPLE_DIR = $(call select_from_ports,libav)/src/lib/libav/libavresample
 
-include $(LIBAVRESAMPLE_DIR)/Makefile
+-include $(LIBAVRESAMPLE_DIR)/Makefile
 
 vpath % $(LIBAVRESAMPLE_DIR)
diff --git a/repos/libports/lib/mk/avutil.inc b/repos/libports/lib/mk/avutil.inc
index eb822f89f..3734f0109 100644
--- a/repos/libports/lib/mk/avutil.inc
+++ b/repos/libports/lib/mk/avutil.inc
@@ -4,6 +4,6 @@ include $(REP_DIR)/lib/import/import-avutil.mk
 
 LIBAVUTIL_DIR = $(call select_from_ports,libav)/src/lib/libav/libavutil
 
-include $(LIBAVUTIL_DIR)/Makefile
+-include $(LIBAVUTIL_DIR)/Makefile
 
 vpath % $(LIBAVUTIL_DIR)
diff --git a/repos/libports/lib/mk/spec/arm/avcodec.mk b/repos/libports/lib/mk/spec/arm/avcodec.mk
index 039e6d51a..d8f94a064 100644
--- a/repos/libports/lib/mk/spec/arm/avcodec.mk
+++ b/repos/libports/lib/mk/spec/arm/avcodec.mk
@@ -2,4 +2,4 @@ CC_C_OPT += -DARCH_ARM=1
 
 include $(REP_DIR)/lib/mk/avcodec.inc
 
-include $(LIBAVCODEC_DIR)/arm/Makefile
+-include $(LIBAVCODEC_DIR)/arm/Makefile
diff --git a/repos/libports/lib/mk/spec/arm/avutil.mk b/repos/libports/lib/mk/spec/arm/avutil.mk
index a95d6eab4..7e8f7ba52 100644
--- a/repos/libports/lib/mk/spec/arm/avutil.mk
+++ b/repos/libports/lib/mk/spec/arm/avutil.mk
@@ -5,4 +5,4 @@ CC_C_OPT += -DARCH_ARM=1
 
 include $(REP_DIR)/lib/mk/avutil.inc
 
-include $(LIBAVUTIL_DIR)/arm/Makefile
+-include $(LIBAVUTIL_DIR)/arm/Makefile
diff --git a/repos/libports/lib/mk/spec/x86/avcodec.inc b/repos/libports/lib/mk/spec/x86/avcodec.inc
index c6f50e3b9..59c33c7a2 100644
--- a/repos/libports/lib/mk/spec/x86/avcodec.inc
+++ b/repos/libports/lib/mk/spec/x86/avcodec.inc
@@ -2,4 +2,4 @@ CC_C_OPT += -DARCH_X86=1
 
 include $(REP_DIR)/lib/mk/avcodec.inc
 
-include $(LIBAVCODEC_DIR)/x86/Makefile
+-include $(LIBAVCODEC_DIR)/x86/Makefile
diff --git a/repos/libports/lib/mk/spec/x86/avutil.inc b/repos/libports/lib/mk/spec/x86/avutil.inc
index 14a3b99de..328171cb9 100644
--- a/repos/libports/lib/mk/spec/x86/avutil.inc
+++ b/repos/libports/lib/mk/spec/x86/avutil.inc
@@ -5,4 +5,4 @@ CC_C_OPT += -DARCH_X86=1
 
 include $(REP_DIR)/lib/mk/avutil.inc
 
-include $(LIBAVUTIL_DIR)/x86/Makefile
+-include $(LIBAVUTIL_DIR)/x86/Makefile
diff --git a/repos/libports/lib/mk/swscale.mk b/repos/libports/lib/mk/swscale.mk
index 666da526f..12bcdc4ce 100644
--- a/repos/libports/lib/mk/swscale.mk
+++ b/repos/libports/lib/mk/swscale.mk
@@ -6,6 +6,6 @@ CC_WARN += -Wno-switch
 
 LIBSWSCALE_DIR = $(call select_from_ports,libav)/src/lib/libav/libswscale
 
-include $(LIBSWSCALE_DIR)/Makefile
+-include $(LIBSWSCALE_DIR)/Makefile
 
 vpath % $(LIBSWSCALE_DIR)