after compiling gcc 5.4.0 what header folders to export - c++

Question

I have compiled gcc 5.4.0 (make, make install into non root folder) and have exported it to anther machine of the same base distro. however when I try to compile a hello world on the 2nd machine I get an error for stdio.h and that cascades to cstdio etc.
for gcc I used configure --prefix=/home/mybin --bindir=/home/mybin/bin --libdir=/home/mybin/lib etc for all available folders as per --help.
On the gcc compile machine it seems the source folder /home/tmp/gcc-5.4.0/libstdc++-v3/include was installed into the --includedir=/home/mybin/include folder with all the sub directories.
Searching for stdio.h on the 5.4.0 compiling machine I get several folders that contain a version of stdio.h.
/home/tmp/gcc-5.4.0/libstdc++-v3/include/tr1/stdio.h
/home/tmp/gcc-5.4.0/libstdc++-v3/include/c_compatibility/stdio.h
/home/tmp/gcc-5.4.0/fixincludes/tests/base/rtldef/stdio.h
/home/tmp/gcc-5.4.0/fixincludes/tests/base/stdio.h
/home/tmp/gcc-5.4.0/libssp/ssp/stdio.h
/home/tmp/gcc-5.4.0/gcc/testsuite/gcc.dg/cpp/usr/include/stdio.h
and the search of the --prefix=/home/mybin/ returns
/home/mybin/lib/gcc/x86_64-unknown-linux-gnu/5.4.0/include/ssp/stdio.h
/home/mybin/include/c++/5.4.0/tr1/stdio.h
/home/mybin/include/c_compatibility/stdio.h
So I copied the ``--prefix=/home/mybin/` folder to the new machine and tried to use
gcc -Wall -I/home/mybin/include/c_compatibility /home/myuser/test.c -o /home/myuser/hello
this gives
In file included from /home/myuser/test.c:3:0:
/home/mybin/include/c_compatibility/stdio.h:29:18: fatal error: cstdio: No such file or directory
BUT I do have
/home/mybin/include/c++/5.4.0/tr1/cstdio
/home/mybin/include/c++/5.4.0/cstdio
/home/mybin/include/c_std/cstdio
/home/mybin/include/c/cstdio
so updated to
gcc -Wall -I/home/mybin/include/c_compatibility -I/home/mybin/include/c_std /home/myuser/test.c -o /home/myuser/hello
In file included from /home/mybin/include/bits/c++config.h:482:0,
from /home/mybin/include/c_std/cstdio:44,
from /home/mybin/include/c_compatibility/stdio.h:29,
from /home/myuser/test.c:3:
/home/mybin/include/bits/os_defines.h:39:22: fatal error: features.h: No such file or directory
compilation terminated.
BUT I do have /home/mybin/include/c++/5.4.0/parallel/features.h
gcc -Wall -I/home/mybin/include/c_compatibility -I/home/mybin/include/c_std /home/myuser/test.c -o /home/myuser/hello
In file included from /home/mybin/include/bits/c++config.h:482:0,
from /home/mybin/include/c_std/cstdio:44,
from /home/mybin/include/c_compatibility/stdio.h:29,
from /home/myuser/test.c:3:
/home/mybin/include/bits/os_defines.h:39:22: fatal error: features.h: No such file or directory
compilation terminated.
gcc -Wall -I/home/mybin/include/c_compatibility -I/home/mybin/include/c_std -I/home/mybin/include/c++/5.4.0/parallel /home/myuser/test.c -o /home/myuser/hello
In file included from /home/mybin/include/bits/c++config.h:482:0,
from /home/mybin/include/c_std/cstdio:44,
from /home/mybin/include/c_compatibility/stdio.h:29,
from /home/myuser/_test.c:3:
/home/mybin/include/bits/os_defines.h:44:19: error: missing binary operator before token "("
#if __GLIBC_PREREQ(2,15) && defined(_GNU_SOURCE)
^
In file included from /home/mybin/include/c_compatibility/stdio.h:29:0,
from /home/myuser/_test.c:3:
/home/mybin/include/c_std/cstdio:96:1: error: unknown type name 'namespace'
namespace std
^
/home/mybin/include/c_std/cstdio:97:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
{
^
/home/mybin/include/c_std/cstdio:155:1: error: unknown type name 'namespace'
namespace __gnu_cxx
^
/home/mybin/include/c_std/cstdio:156:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
{
^
/home/mybin/include/c_std/cstdio:181:1: error: unknown type name 'namespace'
namespace std
^
/home/mybin/include/c_std/cstdio:182:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
{
^
/home/myuser/_test.c:7:1: warning: return type defaults to 'int' [-Wimplicit-int]
main()
^
/home/myuser/test.c: In function 'main':
/home/myuser/test.c:9:5: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
printf("Heh now");
^
/home/myuser/_test.c:9:5: warning: incompatible implicit declaration of built-in function 'printf'
/home/myuser/_test.c:9:5: note: include '<stdio.h>' or provide a declaration of 'printf'
I have tried exporting LD config flags as well
How do I know what folder to export and to other machines made from the same base image so I can compile with this version. Why are the includes not being found or getting confused?
I am using centos7