ecsv avatar ecsv committed a629997

Test for essential build dependencies before getting their cflags/libs

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-CFLAGS += -Wall -ffast-math -msse -fno-strict-aliasing -fvisibility=hidden -I../../src -I../../src/wrapper -DGCC $(shell pkg-config --cflags gl)
+CFLAGS += -Wall -ffast-math -msse -fno-strict-aliasing -fvisibility=hidden -I../../src -I../../src/wrapper -DGCC
 CXXFLAGS += -fvisibility-inlines-hidden
-LDFLAGS += $(shell pkg-config --libs gl)
 # Since we are building a shared library, we must compile with -fPIC for x86_64 CPUs.
 # On 32-bit systems we do not want to use -fPIC because we don't have to and it has a big performance penalty on this arch
   LDFLAGS += -lc
+# test for essential build dependencies
+ifeq ($(shell which pkg-config 2>/dev/null),)
+  $(error pkg-config not found)
+ifeq ($(shell pkg-config --modversion gl 2>/dev/null),)
+  $(error No OpenGL development libraries found!)
+CFLAGS += $(shell pkg-config --cflags gl)
+LDFLAGS += $(shell pkg-config --libs gl)
 # test for presence of SDL
 ifeq ($(shell which sdl-config 2>/dev/null),)
   $(error No SDL development libraries found!)
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