compile external script

Former-commit-id: b3a079e44cf9a47ee8d001226d6c58fa9daee404

scripts/compile_external.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+git clone git@github.com:libigl/libigl.git
+cd libigl/
+make -C external/AntTweakBar/src -f Makefile.osx.igl
+make -C external/yimg
+cd external/tetgen
+make clean
+make -f Makefile.igl tetlib
+rm -f obj/*.o
+rm tetgen
+make -f Makefile.igl tetgen
+mkdir -p ../embree/build
+cd ../embree/build
+cmake .. -DCMAKE_C_COMPILER=/opt/local/bin/gcc -DCMAKE_CXX_COMPILER=/opt/local/bin/g++
+make
+cd ../../tinyxml2
+cmake .
+make
+cd ../../
+make -j12
+make -j12