### 2.3 Building sources using Automake

It is much easier if you use GNU Automake instead of writing your own Makefiles. If you do that, you do not have to worry about finding and invoking the `libgcrypt-config` script at all. Libgcrypt provides an extension to Automake that does all the work for you.

Macro: AM_PATH_LIBGCRYPT ([minimum-version], [action-if-found], [action-if-not-found])

  Check whether Libgcrypt (at least version minimum-version, if given) exists on the host system. If it is found, execute action-if-found, otherwise do action-if-not-found, if given.

  Additionally, the function defines `LIBGCRYPT_CFLAGS` to the flags needed for compilation of the program to find the `gcrypt.h` header file, and `LIBGCRYPT_LIBS` to the linker flags needed to link the program to the Libgcrypt library.

You can use the defined Autoconf variables like this in your `Makefile.am`:

    AM_CPPFLAGS = $(LIBGCRYPT_CFLAGS)
    LDADD = $(LIBGCRYPT_LIBS)