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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 pkg-config script at all.
You can use PKG_CHECK_MODULES macro, or, libgcrypt also
provides an extension to Automake that does all the work for you.
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.
This macro locates for libgcrypt.pc, with cross-compile support.
You can use the defined Autoconf variables like this in your Makefile.am:
AM_CPPFLAGS = $(LIBGCRYPT_CFLAGS) LDADD = $(LIBGCRYPT_LIBS)