Add include dir for node gyp - node.js

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: > imagemagick-native#1.7.0 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

Try:
setting the environment variable CXX=/path/to/g++ -Ipath/to/include
and then restarting the process. If you're using bash this is done by
export CXX="/path/to/g++ -Ipath/to/include"
/path/to/include being where the missing header Magick++.h is located
if that doesn't work you may manually have to set CXX to include the -I in the makefile at /tmp/build_720834c3a32b65d69ae603d7c618e20f/node_modules/imagemagick-native/build then cding into that directory and calling make.

Answer 2

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.

Answer 3

You can also use the "include_dirs" option in your project binding.gyp file. Read more about available options on the format description page.

Answer 4

You can now do OTHER_CFLAGS='-I/usr/local/include' supposedly. See https://github.com/nickdesaulniers/node-nanomsg/pull/144