CMake 3.7.2 Is Not Pulling the Right Compiler

[aserio]

When using CMake to build my project, CMake grabs /usr/bin/c++ to compile my code which is set to gcc 4.8.5. This is not the compiler that I have loaded (gcc/6.3.0). This is the error I see:

-- WARNING: Compilers do not match. In order to compile HPX application it is recommended to use the same compiler as you did for HPX. HPX_CXX_COMPILER=/opt/mn/gcc/6.3.0/bin/c++, CMAKE_CXX_COMPILER=/usr/bin/c++. HPX_CXX_COMPILER_ID=GNU, CMAKE_CXX_COMPILER_ID=GNU. To disable this message set HPX_IGNORE_COMPILER_COMPATIBILITY to On.
-- Using tcmalloc allocator.
CMake Warning at CMakeLists.txt:9 (find_package):
Found package configuration file:

/home/aserio/lib/hpx_v1.0.0-gcc6.3.0/lib/cmake/HPX/HPXConfig.cmake

but it set HPX_FOUND to FALSE so package "HPX" is considered to be NOT
FOUND. Reason given by package:

Compilers do not match. In order to compile HPX application it is;
recommended to use the same compiler as you did for HPX.
;HPX_CXX_COMPILER=/opt/mn/gcc/6.3.0/bin/c++,
;CMAKE_CXX_COMPILER=/usr/bin/c++. ;HPX_CXX_COMPILER_ID=GNU,
;CMAKE_CXX_COMPILER_ID=GNU. ;To disable this message set
HPX_IGNORE_COMPILER_COMPATIBILITY to On.

I was able to work around the problem by manually setting the compiler path.