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16.2 Compiler options

Let’s denote as LIBUNISTRING_PREFIX the value of the ‘--prefix’ option that you passed to configure while installing this package. If you didn’t pass any ‘--prefix’ option, then the package is installed in /usr/local.

Let’s denote as LIBUNISTRING_INCLUDEDIR the directory where the include files were installed. This is usually the same as ${LIBUNISTRING_PREFIX}/include. Except that if you passed an ‘--includedir’ option to configure, it is the value of that option.

Let’s further denote as LIBUNISTRING_LIBDIR the directory where the library itself was installed. This is the value that you passed with the ‘--libdir’ option to configure, or otherwise the same as ${LIBUNISTRING_PREFIX}/lib. Recall that when building in 64-bit mode on a 64-bit GNU/Linux system that supports executables in either 64-bit mode or 32-bit mode, you should have used the option --libdir=${LIBUNISTRING_PREFIX}/lib64.

So that the compiler finds the include files, you have to pass it the option -I${LIBUNISTRING_INCLUDEDIR}.

So that the compiler finds the library during its linking pass, you have to pass it the options -L${LIBUNISTRING_LIBDIR} -lunistring. On some systems, in some configurations, you also have to pass options needed for linking with libiconv. The autoconf macro gl_LIBUNISTRING (see Autoconf macro) deals with this particularity.