Read CC from environment

Instead of using /usr/bin/cc, which is always just gcc.

lpsolve.spec

@@ -10,6 +10,7 @@ BuildRequires: gcc-c++
 
 Patch0:    lpsolve-5.5.0.11.cflags.patch
 Patch1:    lpsolve-5.5.2.0.defines.patch
+Patch2:    read-cc-from-env.patch
 
 %description
 Mixed Integer Linear Programming (MILP) solver lpsolve solves pure linear,
@@ -26,6 +27,7 @@ Includes and definitions for developing with lpsolve
 %setup -q -n lp_solve_5.5
 %patch0 -p1 -b .cflags.patch
 %patch1 -p1 -b .defines.patch
+%patch2 -p1 -b .cc-from-env.patch
 
 %build
 %set_build_flags

read-cc-from-env.patch

@@ -0,0 +1,22 @@
+diff -ruN lp_solve_5.5.orig/lp_solve/ccc lp_solve_5.5/lp_solve/ccc
+--- lp_solve_5.5.orig/lp_solve/ccc	2020-12-08 12:24:15.118953722 +0100
++++ lp_solve_5.5/lp_solve/ccc	2020-12-08 12:49:39.661428497 +0100
+@@ -1,6 +1,6 @@
+ :
+ src='../lp_MDO.c ../shared/commonlib.c ../colamd/colamd.c ../shared/mmio.c ../shared/myblas.c ../ini.c ../fortify.c ../lp_rlp.c ../lp_crash.c ../bfp/bfp_LUSOL/lp_LUSOL.c ../bfp/bfp_LUSOL/LUSOL/lusol.c ../lp_Hash.c ../lp_lib.c ../lp_wlp.c ../lp_matrix.c ../lp_mipbb.c ../lp_MPS.c ../lp_params.c ../lp_presolve.c ../lp_price.c ../lp_pricePSE.c ../lp_report.c ../lp_scale.c ../lp_simplex.c lp_solve.c ../lp_SOS.c ../lp_utils.c ../yacc_read.c'
+-c=cc
++c=$CC
+ 
+ #determine platform (32/64 bit)
+ >/tmp/platform.c
+diff -ruN lp_solve_5.5.orig/lpsolve55/ccc lp_solve_5.5/lpsolve55/ccc
+--- lp_solve_5.5.orig/lpsolve55/ccc	2020-12-08 12:24:15.118953722 +0100
++++ lp_solve_5.5/lpsolve55/ccc	2020-12-08 12:40:22.677752522 +0100
+@@ -1,6 +1,6 @@
+ :
+ src='../lp_MDO.c ../shared/commonlib.c ../shared/mmio.c ../shared/myblas.c ../ini.c ../fortify.c ../colamd/colamd.c ../lp_rlp.c ../lp_crash.c ../bfp/bfp_LUSOL/lp_LUSOL.c ../bfp/bfp_LUSOL/LUSOL/lusol.c ../lp_Hash.c ../lp_lib.c ../lp_wlp.c ../lp_matrix.c ../lp_mipbb.c ../lp_MPS.c ../lp_params.c ../lp_presolve.c ../lp_price.c ../lp_pricePSE.c ../lp_report.c ../lp_scale.c ../lp_simplex.c ../lp_SOS.c ../lp_utils.c ../yacc_read.c'
+-c=cc
++c=$CC
+ 
+ #determine platform (32/64 bit)
+ >/tmp/platform.c