Fix a bug in Makefiles for buildouts.

Makefile

-ifeq ($(INCLUDE_PYTHON),)
-	INCLUDE_PYTHON = $(shell pkg-config --cflags python3 | cut -f 1 -d " ")
-endif
 ifeq ($(PREFIX),)
 	PREFIX := /usr
 endif
@@ -17,7 +14,7 @@ bin/metadata-collect-agent:
 	mkdir -p build/metadata-collect-agent/logs ;\
 	cp src/main.cpp build/metadata-collect-agent/
 	cd build/metadata-collect-agent ;\
-	INCLUDE_PYTHON=$(INCLUDE_PYTHON) PREFIX=$(PREFIX) make
+	make
 	install -m 744 build/metadata-collect-agent/metadata-collect-agent bin/
 
 lib/fluentbit_wendelin.so:

installation/metadata-collect-agent/Makefile

 
+ifeq ($(PYTHON),)
+else
+	INCLUDE_PYTHON = -I$(PYTHON)
+endif
 ifeq ($(INCLUDE_PYTHON),)
 	INCLUDE_PYTHON = $(shell pkg-config --cflags python3 | cut -f 1 -d " ")
 else