Fixed #1082 (#1085)

diff --git a/src/pkgconfig.in b/src/pkgconfig.in
index d4c3752..368a794 100644
--- a/src/pkgconfig.in
+++ b/src/pkgconfig.in
@@ -1,7 +1,7 @@
 prefix=@CMAKE_INSTALL_PREFIX@
 exec_prefix=${prefix}
 includedir=${prefix}/include
-libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
 
 Name: @CMAKE_PROJECT_NAME@
 Description: @NN_DESCRIPTION@