Package libzmq was not found

[life0fun]

Issue with npm install zmq.

libzmq was installed under /usr/local/lib,
/usr/local/lib/pkgconfig/libzmq.pc exists.
PKG_CONFIG_PATH sets to /usr/local/lib/pkgconfig

mac osx 10.5

npm install zeromq also could not find libzmq, but went through and everything worked.

[life0fun]

problem solved!

1. export PKG_CONFIG_PATH="/usr/local/lib/pkgconfig"
2. sudo visudo, add
   Defaults env_keep += "PKG_CONFIG_PATH"
3. sudo npm install zmq -g

[ashearer]

Also reproduced on Lion (Mac OS X 10.7). Same solution as above, simplified to a one-liner:

sudo PKG_CONFIG_PATH="/usr/local/lib/pkgconfig" npm install zmq -g

[nicerobot]

I had this error and it was due to my version of pkg-config installed by the Mono.framework didn't know about MacPorts' /opt/local/lib path. I simply removed Mono but another alternative similar to the PKG_CONFIG_PATH solution might be

PATH=/opt/local/bin:${PATH} npm install zmq