add assimp target as optional dependancy of all

.gitignore

@@ -1,5 +1,6 @@
 bin/
 build/
+ext/assimp
 doc/
 msvc/.vs/
 msvc/x64/

Makefile

@@ -13,22 +13,23 @@ LIBNAME = libTangerine.a
 RENDER_SOURCES = $(wildcard $(SRCDIR)/*.cpp)
 RENDER_OBJECTS = $(patsubst $(SRCDIR)/%.cpp, $(OBJDIR)/%.o, $(RENDER_SOURCES))
 
+# NOTE: target to automatically build a current release of assimp. Fixes
+# 	issue on Fedora where the default assimp version doesn't support glTF2
 ASSIMP_DIR=ext/assimp
 
 ifeq ($(USE_INTERNAL_ASSIMP), y)
-$(info using internal assimp)
 CXXFLAGS += -I$(ASSIMP_DIR)/include
+BUILD_ASSIMP_TARGET := build_assimp
 endif
 
-all: mkdirs $(LIBNAME) examples
+
+all: mkdirs $(BUILD_ASSIMP_TARGET) $(LIBNAME) examples
 .PHONY: all
 
 -include $(OBJDIR)/*.d
 
-# NOTE: target to automatically build a current release of assimp. Fixes
-# 	issue on Fedora where the default assimp version doesn't support glTF2
 build_assimp:
-	if [ ! -d $(ASSIMP_DIR) ]; then	\
+	@if [ ! -d $(ASSIMP_DIR) ]; then	\
 		git clone -n "https://github.com/assimp/assimp" $(ASSIMP_DIR); \
 		cd $(ASSIMP_DIR); \
 		git checkout -q v5.0.1; \