Add include dir for node gyp

Question

I am deploying a node-js app to heroku that requires the npm package imagemagic-native.

I made the buildpack install libmagick++-dev and export the include path:

export INCLUDE_PATH="$BUILD_DIR/.apt/usr/include:$INCLUDE_PATH"
export CPATH="$INCLUDE_PATH"
export CPPPATH="$INCLUDE_PATH"

Upon installing the imagemagic-native package with npm install, node-gyp is invoked to compile it's binaries. However I get this error:

remote:        > [email protected] install /tmp/build_720834c3a32b65d69ae603d7c618e20f/node_modules/imagemagick-native
remote:        > node-gyp rebuild
remote:        
remote:        make: Entering directory `/tmp/build_720834c3a32b65d69ae603d7c618e20f/node_modules/imagemagick-native/build'
remote:          CXX(target) Release/obj.target/imagemagick/src/imagemagick.o
remote:        In file included from ../src/imagemagick.cc:9:
remote:        ../src/imagemagick.h:1:22: warning: Magick++.h: No such file or directory

This suggests that gcc doesn't see the header files for libmagick++, because $CCPATH is not available to it.

How can I make npm install add the path to the list of include_dirs that node-gyp uses?

More detail about my use case is here: Using Magick++ in a node.js application on heroku

Answer 1

I've spent some time trying to answer the same question. In the end, i've found the proper way to do this here. You need to set 'include_dirs' property in ~/.node-gyp/x.x.x/common.gypi. This is how I've set the include dir on Mac OS to /opt/local/include/ (which is where all macports intalls go):

...
['OS=="mac"', {
  'defines': ['_DARWIN_USE_64_BIT_INODE=1'],
  'include_dirs': ['/opt/local/include'],
  'xcode_settings': {
    'ALWAYS_SEARCH_USER_PATHS': 'NO',
...

Though I'm not sure it's applicable for heroku environment.