Patch by Robert Scheck <robert@fedoraproject.org> for dislocker >= 0.5.1 to ensure that
library is getting installed into ${LIB_INSTALL_DIR} if it's defined via cmake. Otherwise
use the previous detection mechanism (which fails on Fedora and RHEL, because rubygems is
shipping /usr/lib/gems/ruby and /usr/lib64/gems/ruby directories on all architectures and
thus leads to /usr/lib64 for ix86); see: https://github.com/Aorimn/dislocker/issues/59

--- dislocker-0.5.1/src/CMakeLists.txt			2016-01-03 16:55:16.000000000 +0100
+++ dislocker-0.5.1/src/CMakeLists.txt.libdir		2016-01-11 01:28:38.000000000 +0100
@@ -132,12 +132,16 @@
   set(mandir ${sharedir}/man)
 endif()
 
-if(NOT DEFINED libdir)
-	if(IS_DIRECTORY "${CMAKE_INSTALL_PREFIX}/lib64")
-		set(libdir "${CMAKE_INSTALL_PREFIX}/lib64")
-	else()
-		set(libdir "${CMAKE_INSTALL_PREFIX}/lib")
+if(NOT DEFINED LIB_INSTALL_DIR)
+	if(NOT DEFINED libdir)
+		if(IS_DIRECTORY "${CMAKE_INSTALL_PREFIX}/lib64")
+			set(libdir "${CMAKE_INSTALL_PREFIX}/lib64")
+		else()
+			set(libdir "${CMAKE_INSTALL_PREFIX}/lib")
+		endif()
 	endif()
+else()
+	set(libdir ${LIB_INSTALL_DIR})
 endif()
 
 if(NOT DEFINED bindir)