Using pkg-config to detect libraries installed using homebrew

http://flummox-engineering.blogspot.com/2015/01/osx-cmake-no-package-gnutls-found.html

Using pkg-config to detect libraries installed using homebrew

If you are trying to link to a library installed via Homebrew, I suggest reading
this article.

Whilst trying to build OpenVAS on OSX, I encounter this message. 

Package gnutls was not found in the pkg-config search path.
Perhaps you should add the directory containing `gnutls.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gnutls' found
Package gnutls was not found in the pkg-config search path.
Perhaps you should add the directory containing `gnutls.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gnutls' found

This is surprising because I have the latest version of GnuTLS installed viaHomebrew. pkg-config cannot find it though

$ pkg-config --cflags gnutls

Package gnutls was not found in the pkg-config search path.

Perhaps you should add the directory containing `gnutls.pc'

to the PKG_CONFIG_PATH environment variable

No package 'gnutls' found

Add the pkg-config configuration file /usr/local/opt/gnutls/lib/pkgconfig/gnutls.pc to PKG_CONFIG_PATH and now pkg-config will be able to locate it

$ PKG_CONFIG_PATH=/usr/local/opt/gnutls/lib/pkgconfig pkg-config --cflags gnutls
Package libtasn1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libtasn1.pc'
to the PKG_CONFIG_PATH environment variable

Not so fast! GNuTLS itself has a couple of dependencies. You can either install them:

$ brew install libtasn1 p11-kit

Or in my case they had been installed, but not properly linked by homebrew:

$ brew link libtasn1 p11-kit

Now pkg-config can locate the GnuTLS library and header files

$ PKG_CONFIG_PATH=/usr/local/opt/gnutls/lib/pkgconfig pkg-config --cflags gnutls
-I/usr/local/Cellar/gnutls/3.1.10/include -I/usr/local/Cellar/libtasn1/4.2/include -I/usr/local/Cellar/p11-kit/0.18.4/include/p11-kit-1 

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Posted 9th January 2015 by Hanxue
Lee

Labels: automake cmake OSX