Updated code to build properly on Linux

README.md

@@ -40,6 +40,9 @@ GLEW, GLU, freetype2, libvorbisfile, libvorbis, libogg, libopenal, libbz2,
 libXRandR, and libcurl.
 
 
+sudo apt install libglew-dev libogg-dev libopenal-dev libvorbis-dev zlib1g-dev libfreetype-dev libx11-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev libgl1-mesa-dev libglew-dev
+
+
 ## Differences with Commercial Version
 * The music is not part of the open source release of Star Ruler 2. The data/music/ directory from the commercial
   release can be copied directly into the data/ directory of an open-source build. The music will be detected and played.

source/glfw/CMakeLists.txt

@@ -1,6 +1,7 @@
 project(GLFW C)
 
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 4.0.0)
+set(CMAKE_CXX_STANDARD 11)
 
 set(GLFW_VERSION_MAJOR "3")
 set(GLFW_VERSION_MINOR "0")

source/linux/Makefile

@@ -13,6 +13,9 @@ else
 	OSNAME = lin
 endif
 
+CXXFLAGS += -fPIC
+LDFLAGS += -lGLEW -lGL -lX11 -lXrandr -lfreetype -lz -lm
+
 ifdef DEBUG
 	BINDIR = bin_d/$(OSNAME)$(ARCH)
 	OBJDIR = obj_d/$(OSNAME)$(ARCH)
@@ -36,12 +39,12 @@ else
 endif
 ifndef NLTO
 ifeq (,$(findstring g++, $(CC)))
-	CXXFLAGS += -flto=6
+	#CXXFLAGS += -flto=6
 else
-	CXXFLAGS += -flto=thin
+	#CXXFLAGS += -flto=thin
 endif
 else
-	CXXFLAGS += -fno-lto
+	#CXXFLAGS += -fno-lto
 endif
 endif
 
@@ -323,7 +326,7 @@ $(OBJDIR)/%.o: $(SRCDIR)/%.cpp
 #Complete binary compile
 $(BINDIR)/$(BIN): makelibs $(OBJ_FILES) $(LIB_FILES) $(COPY_LIBS)
 	@mkdir -p $(BINDIR)
-	@$(CC) $(CXXFLAGS) $(LDFLAGS) $(OBJ_FILES) $(LIB_FILES) -o $@
+	@$(CC) $(CXXFLAGS) $(OBJ_FILES) $(LIB_FILES) -o $@ $(LDFLAGS) -lGL -lGLU -lX11 -lXrandr -lXxf86vm -lXi -lopenal -lcurl -lpng -lvorbisfile
 
 makelibs:
 	@mkdir -p $(BINDIR)