Compiling on Linux Mint

[Spirou4D]

Hi Gilbo,
I am on Linux Mint Rosa 17.3 64bytes.
I have installed with the app manager:
Clang3.5 and llvm-3.5 and libgpm10
but error with GPM path so I choose of compiling my-self GPM 6.1:
I download it and compile: I find it here on my computer:
GMP_INC_DIR = /usr/include
GMP_LIB_DIR = /usr/lib
I modify the makeConstant and no error for GPM but this now:
++++++++++++++++++++++++++++++++++
~/Applications/cork $ make
Compiling obj/cork.o
make: clang++: commande introuvable
make: *** [obj/cork.o] Erreur 127
++++++++++++++++++++++++++++++++++

but clang 3.5 is installed
clang-3.5 is already the latest version.
0 mis à jour, 0 nouvellement installés, 0 à enlever et 1 non mis à jour.

Terminal: clang-3.5 --help
OVERVIEW: clang LLVM compiler
USAGE: clang [options]
OPTIONS:
-### Print (but do not run) the commands to run for this compilation
--analyze Run the static analyzer
-arcmt-migrate-emit-errors
Emit ARC errors even if the migrator can fix them
-arcmt-migrate-report-output
Output path for the plist report
-cxx-isystem
Add direct
Etc......

so no problem with clang-3.5!
Where is the problem, please?

EDIT: I changed clang++ with clang-3.5 in the makefile
line 37 CPP11_FLAGS := -std=c++11
line 38 CC := clang
line 39 CXX := clang-3.5
and
$ make
then, the compilation has begun......BUT now I have this error:

patrinux@patrinux-ordi ~/Applications/cork $ make
Compiling obj/cork.o
Compiling obj/util/timer.o
Compiling obj/util/log.o
Compiling obj/isct/empty3d.o
In file included from src/isct/empty3d.cpp:31:
src/isct/gmpext4.h:35:10: fatal error: 'gmpxx.h' file not found

include <gmpxx.h>

Here I can't solve the question! Can you help me, please?