$ ldd `which guix-daemon` 
	linux-vdso.so.1 =>  (0x00007fffc9ffe000)
	libbz2.so.1.0 => /lib/x86_64-linux-gnu/libbz2.so.1.0 (0x00007f26792c1000)
	libsqlite3.so.0 => /usr/lib/x86_64-linux-gnu/libsqlite3.so.0 (0x00007f2679008000)
	libgcrypt.so.11 => /lib/x86_64-linux-gnu/libgcrypt.so.11 (0x00007f2678d88000)
	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f2678a84000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f267886e000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f26784a7000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f2678289000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f2678085000)
	libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f2677e7f000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f2677b79000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f26794fe000)
$ grep ^LIBGCRYPT_CFLAGS config.log
LIBGCRYPT_CFLAGS='-I/include'