diff --git a/cmake/Modules/GrPlatform.cmake b/cmake/Modules/GrPlatform.cmake
index ce2e15f..dde65ce 100644
--- a/cmake/Modules/GrPlatform.cmake
+++ b/cmake/Modules/GrPlatform.cmake
@@ -37,10 +37,18 @@ if(LINUX AND EXISTS "/etc/redhat-release")
     set(REDHAT TRUE)
 endif()

+if(LINUX AND EXISTS "/etc/slackware-version")
+    set(SLACKWARE TRUE)
+endif()
+
 ########################################################################
 # when the library suffix should be 64 (applies to redhat linux family)
 ########################################################################
-if(NOT DEFINED LIB_SUFFIX AND REDHAT AND CMAKE_SYSTEM_PROCESSOR MATCHES "64$")
+if (REDHAT OR SLACKWARE)
+    set(LIB64_CONVENTION TRUE)
+endif()
+
+if(NOT DEFINED LIB_SUFFIX AND LIB64_CONVENTION AND CMAKE_SYSTEM_PROCESSOR MATCHES "64$")
     set(LIB_SUFFIX 64)
 endif()
 set(LIB_SUFFIX ${LIB_SUFFIX} CACHE STRING "lib directory suffix")