*** ./unix/Makefile.ORIG	Wed Jul 27 14:56:40 2016
--- ./unix/Makefile	Wed Jul 27 14:58:59 2016
***************
*** 22,28 ****
  LN = ln -s
  
  # (to use the GNU compiler, change cc to gcc in CC)
! CC = cc
  BIND = $(CC)
  AS = $(CC) -c
  CPP = /lib/cpp
--- 22,28 ----
  LN = ln -s
  
  # (to use the GNU compiler, change cc to gcc in CC)
! CC = xlc_r
  BIND = $(CC)
  AS = $(CC) -c
  CPP = /lib/cpp
***************
*** 58,64 ****
  #   LFLAGS1   flags after output file spec, before obj file list
  #   LFLAGS2   flags after obj file list (libraries, etc)
  CFLAGS_NOOPT = -I. -DUNIX $(LOCAL_ZIP)
! CFLAGS = -O2 $(CFLAGS_NOOPT)
  LFLAGS1 =
  LFLAGS2 = -s
  
--- 58,64 ----
  #   LFLAGS1   flags after output file spec, before obj file list
  #   LFLAGS2   flags after obj file list (libraries, etc)
  CFLAGS_NOOPT = -I. -DUNIX $(LOCAL_ZIP)
! CFLAGS = $(CFLAGS_NOOPT)
  LFLAGS1 =
  LFLAGS2 = -s
  
*** ./unix/configure.ORIG	Wed Jul 27 15:02:26 2016
--- ./unix/configure	Wed Jul 27 15:02:38 2016
***************
*** 110,116 ****
            rm -f conftest
          fi
        else
!         CFLAGS_OPT='-O'
          echo "  Other-unknown C ($CFLAGS_OPT)"
        fi
      fi
--- 110,116 ----
            rm -f conftest
          fi
        else
!         CFLAGS_OPT='-O3'
          echo "  Other-unknown C ($CFLAGS_OPT)"
        fi
      fi