FIX: Boost_* variables are now deleted from cache to prevent preserving wrong paths.

FindBoost.cmake

@@ -28,6 +28,7 @@ if(NOT Boost_FIND_COMPONENTS)
 endif()
 
 # Look for a standard boost header file.
+set(Boost_INCLUDE_DIRS "Boost_INCLUDE_DIRS-NOTFOUND")
 find_path(
     Boost_INCLUDE_DIRS
 
@@ -41,19 +42,16 @@ find_path(
 
 
     PATHS
-        /usr/include/boost
+        /usr/include
         /home/boost
 
     PATH_SUFFIXES
         boost
         include
-
-)    
+)
 
 if(NOT Boost_INCLUDE_DIRS)
     message(FATAL_ERROR "Boost include directory was not found! Please, set variable BOOST_INCLUDEDIR to the correct path.")
-#else()
-#    include_directories("${Boost_INCLUDE_DIRS}")
 endif()
 
 # Create a list of requested Boost libraries with "system" names
@@ -79,6 +77,7 @@ foreach(COMPONENT ${Boost_FIND_COMPONENTS})
 endforeach()
 
 # Look for libraries specified by COMPONENTS flag
+set(Boost_LIBRARY_DIRS "Boost_LIBRARY_DIRS-NOTFOUND")
 find_path(
     Boost_LIBRARY_DIRS
     
@@ -90,7 +89,6 @@ find_path(
         $ENV{BOOST_LIBRARYDIR}
         ${CMAKE_CURRENT_LIST_DIR}/external_dependencies/boost
 
-
     PATHS
         /usr/lib/boost
         /usr/lib/x86_64-linux-gnu
@@ -104,6 +102,7 @@ find_path(
 # targets, so they may be linked
 set(Boost_LIBRARIES ${REQUESTED_BOOST_LIBS})
 foreach(LIBNAME ${Boost_LIBRARIES})
+    set(${LIBNAME} "${LIBNAME}-NOTFOUND")
     find_library(
         ${LIBNAME}
 
@@ -115,11 +114,7 @@ foreach(LIBNAME ${Boost_LIBRARIES})
         $ENV{BOOST_LIBRARYDIR}
         ${CMAKE_CURRENT_LIST_DIR}/external_dependencies/boost
 
-
         PATHS
-        ${BOOST_LIBRARYDIR}
-        $ENV{BOOST_LIBRARYDIR}
-        ${CMAKE_CURRENT_LIST_DIR}/external_dependencies/boost
         /usr/lib/boost
         /usr/lib/x86_64-linux-gnu