Using pkg-config

Like other GNOME libraries, libgtherm uses pkg-config to provide compiler options. The package name is "libgtherm-0.0". So in your configure.ac script, you might specify something like:

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PKG_CHECK_MODULES(LIBGTHERM, [libgtherm-0.0])
AC_SUBST(LIBGTHERM_CFLAGS)
AC_SUBST(LIBGTHERM_LIBS)

Or if using Meson/Ninja use a dependency('libgtherm-0.0') dependency.

The "0.0" in the package name is the "API version" (indicating "the version of the libgtherm API that first appeared in version 0.0") and is essentially just part of the package name.

When using the Meson build system you can declare a dependency like

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dependency('libgtherm-0.0')

Acknowledge the Instability

Since the library is young and is still changing a lot, in order to use it you are required to acknowledge that your are using an unstable API. To do so, GTHERM_USE_UNSTABLE_API must be defined for compilation to succeed.

From C code or any compatible language, you can prefix your inclusion of the libgtherm header like so:

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#define LIBGTHERM_USE_UNSTABLE_API
#include <libgtherm.h>

Including individual headers rather than libgtherm.h is not recommended.

You can also acknoledge this with the definition option of your C compiler, like -DLIBGTHERM_USE_UNSTABLE_API. This is required from Vala.

To use libgtherm from Vala, you must define the acknowledgment in C via -X -DLIBGTHERM_USE_UNSTABLE_API. If your build system uses a two pass compilation and hence your Vala compiler outputs C (Meson, Automake, or using the --ccode Vala compiler option trigger that) then you must add -DLIBGTHERM_USE_UNSTABLE_API to your C compiler argments instead.