Add make toolchains for msys, msys-win32 and msys-win64

Makefile

@@ -45,6 +45,7 @@ GLEW_DEST ?= /usr
 BINDIR    ?= $(GLEW_DEST)/bin
 LIBDIR    ?= $(GLEW_DEST)/lib
 INCDIR    ?= $(GLEW_DEST)/include/GL
+PKGDIR    ?= $(GLEW_DEST)/lib/pkgconfig
 
 ifneq ($(GLEW_NO_GLU), -DGLEW_NO_GLU)
 LIBGLU = glu
@@ -229,9 +230,9 @@ install.include:
 	$(INSTALL) -m 0644 include/GL/glxew.h "$(DESTDIR)$(INCDIR)/"
 
 install.pkgconfig: glew.pc
-	$(INSTALL) -d -m 0755 "$(DESTDIR)$(LIBDIR)"
-	$(INSTALL) -d -m 0755 "$(DESTDIR)$(LIBDIR)/pkgconfig"
-	$(INSTALL) -m 0644 glew.pc "$(DESTDIR)$(LIBDIR)/pkgconfig/"
+	$(INSTALL) -d -m 0755 "$(DESTDIR)$(PKGDIR)"
+	$(INSTALL) -d -m 0755 "$(DESTDIR)$(PKGDIR)"
+	$(INSTALL) -m 0644 glew.pc "$(DESTDIR)$(PKGDIR)/"
 
 uninstall:
 	$(RM) "$(DESTDIR)$(INCDIR)/wglew.h"

README.md

@@ -73,8 +73,37 @@ RedHat/CentOS/Fedora: `$ sudo yum install libXmu-devel libXi-devel libGL-devel g
 
 ### Windows
 
+#### Visual Studio
+
 Use the provided Visual Studio project file in build/vc12/
 
+Projects for vc6 and vc10 are also provided
+
+#### MSYS/Mingw
+
+Available from [Mingw](http://www.mingw.org/)
+
+Requirements: bash, make, gcc
+
+	$ mingw32-make
+	$ mingw32-make install
+	$ mingw32-make install.all
+
+Alternative toolchain:  `SYSTEM=mingw-win32`
+
+#### MSYS2/Mingw-w64
+
+Available from [Msys2](http://msys2.github.io/) and/or [Mingw-w64](http://mingw-w64.org/)
+
+Requirements: bash, make, gcc
+
+	$ pacman -S gcc make  mingw-w64-i686-gcc mingw-w64-x86_64-gcc 
+	$ make
+	$ make install
+	$ make install.all
+
+Alternative toolchain:  `SYSTEM=msys, SYSTEM=msys-win32, SYSTEM=msys-win64`
+
 ## glewinfo
 
 `glewinfo` is a command-line tool useful for inspecting the capabilities of an

config/Makefile.msys

@@ -3,6 +3,7 @@ NAME = glew32
 CC := gcc
 LD := gcc
 LN :=
+CFLAGS.EXTRA += -D_WIN32
 LDFLAGS.GL = -lopengl32 -lgdi32 -luser32 -lkernel32
 LDFLAGS.EXTRA =
 LIBDIR = $(GLEW_DEST)/bin

config/Makefile.msys-win32

@@ -0,0 +1,5 @@
+include config/Makefile.msys
+
+POPT := -march=i686 -mtune=generic -O2
+CFLAGS.EXTRA  += -m32
+LDFLAGS.EXTRA += -m32

config/Makefile.msys-win64

@@ -0,0 +1,5 @@
+include config/Makefile.msys
+
+POPT := -mtune=generic -O2
+CFLAGS.EXTRA  += -m64
+LDFLAGS.EXTRA += -m64