FreeBSD build Exim issue

Code:

Trying to make exim...
/bin/sh scripts/source_checks

>>> Creating links to source files...
>>> Creating lookups/Makefile for building dynamic modules
>>> New Makefile & lookups/Makefile installed
>>> Use "make makefile" if you need to force rebuilding of the makefile

/bin/sh ../scripts/Configure-os.c
gcc buildconfig.c
/bin/sh: gcc: not found
*** Error code 127

Stop.
make[1]: stopped in /usr/local/directadmin/custombuild/exim-4.89/build-FreeBSD-amd64
*** Error code 1

Stop.
make: stopped in /usr/local/directadmin/custombuild/exim-4.89
-e n*** The make has failed, would you like to try to make again? (y,n): n

Code:

root@srv2:/usr/local/directadmin/custombuild # portmaster -L | grep gcc
===>>> gcc-ecj-4.5
===>>> gcc48-4.8.5_6
===>>> gcc5-5.5.0

root@srv2:/usr/local/directadmin/custombuild # /usr/local/bin/gcc48 --version
gcc48 (FreeBSD Ports Collection) 4.8.5

root@srv2:/usr/local/directadmin/custombuild # /usr/local/bin/gcc5 --version
gcc5 (FreeBSD Ports Collection) 5.5.0