put correct install path for Cubature, d'oh

Author: 20DM

cmake_files/LookUpCubature.cmake

@@ -14,14 +14,15 @@ if(NOT Cubature_GIT_TAG)
   set(Cubature_GIT_TAG master)
 endif()
 
+set(Cubature_DIR "${CMAKE_INSTALL_PREFIX}/external")
 ExternalProject_Add(
   Lookup-Cubature
   GIT_REPOSITORY ${Cubature_GIT_REPOSITORY}
   GIT_TAG ${Cubature_GIT_TAG}
   PREFIX "${CMAKE_BINARY_DIR}/external"
   #INSTALL_DIR ${EXTERNAL_ROOT}
   CMAKE_ARGS
-  -DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}/external
+  -DCMAKE_INSTALL_PREFIX=${Cubature_DIR}
   -DCMAKE_INSTALL_LIBDIR=${CMAKE_SHARED_LIBRARY_PREFIX}
   # Wrap download, configure and build steps in a script to log output
   UPDATE_COMMAND ""
@@ -30,8 +31,6 @@ ExternalProject_Add(
   LOG_BUILD ON
   LOG_INSTALL ON
 )
-ExternalProject_Get_Property(Lookup-Cubature install_dir)
-set(Cubature_DIR "${install_dir}")
 set(Cubature_INCLUDE_DIR "${Cubature_DIR}/include")
 set(Cubature_LIBRARY_DIR "${Cubature_DIR}/${CMAKE_SHARED_LIBRARY_PREFIX}")
 set(Cubature_LIBRARIES "cubature")