fix makefile and add more context to readme

Author: axe312ger

src/projectM-emscripten/Makefile.am

@@ -4,7 +4,6 @@ ${my_CFLAGS} \
 -DSYSCONFDIR=\""$(sysconfdir)"\" \
 -I${top_srcdir}/src/libprojectM \
 -I${top_srcdir}/src/libprojectM/Renderer \
-USE_SDL=2 \
 ${SDL_CFLAGS}
 
 REALSRCDIR=${top_srcdir}/src/projectM-sdl

src/projectM-emscripten/README

@@ -1,15 +1,20 @@
 Building w/ emscripten
 
-* Activate the emsdk
+* Activate the emsdk (https://github.com/juj/emsdk#installation-instructions)
+* make sure you are in the root directory of this project
+* `mkdir vendor && cp /usr/local/Cellar/glm/xx/include/glm ./vendor/`
+* on fresh repositories: `./autogen.sh`
 * `emconfigure ./configure --enable-emscripten --enable-gles --enable-sdl`
 * `emmake make -j4`
 
-
-
-
+emcc -Isrc/libprojectm -Isrc/libprojectM/Renderer -Llib -Ivendor \
+  src/libprojectM/KeyHandler.cpp src/projectM-emscripten/projectM_SDL_emscripten.cpp \
+  -lRenderer -lprojectM -lMilkdropPresetFactory -lprojectM -lRenderer \
+  -s USE_SDL=2 -s LEGACY_GL_EMULATION=1 \
+  -o build/projectEM.html
 
 emcc -I../libprojectm -I../libprojectM/Renderer -Llib \
   ../libprojectM/KeyHandler.cpp projectM_SDL_emscripten.cpp \
   -lRenderer -lprojectM -lMilkdropPresetFactory -lprojectM -lRenderer \
   -s USE_SDL=2 -s LEGACY_GL_EMULATION=1 \
-  -o build/projectEM.html
+  -o build/projectEM.html