Remove unused variables from the build system: HBC, NHC, MKDEPENDHS

configure.ac

@@ -381,9 +381,6 @@ AC_ARG_WITH(hc,
 )
 AC_SUBST(WithHc)
 
-AC_PATH_PROGS(NHC,nhc nhc98)
-AC_PATH_PROG(HBC,hbc)
-
 # This uses GHC, so put it after the "GHC is required" check above:
 FP_INTREE_GHC_PWD
 FP_FIND_ROOT

mk/config.mk.in

@@ -457,12 +457,9 @@ GENERATED_FILE  = chmod a-w
 EXECUTABLE_FILE = chmod +x
 
 #-----------------------------------------------------------------------------
-# Haskell compilers and mkdependHS
+# Installed GHC
 
-# $(GHC), $(HBC) and $(NHC) point to installed versions of the relevant
-# compilers, if available.
-#
-# $(MKDEPENDHS) is the Haskell dependency generator (ghc -M).
+# $(GHC) points to installed version of the compiler.
 #
 # NOTE: Don't override $(GHC) in build.mk, use configure --with-ghc instead
 # (because the version numbers have to be calculated).
@@ -480,9 +477,6 @@ GhcDir          = $(dir $(GHC))
 # Set to YES if $(GHC) has the editline package installed
 GhcHasEditline	= @GhcHasEditline@
 
-HBC		= @HBC@
-NHC		= @NHC@
-
 # Sometimes we want to invoke ghc from the build tree in different
 # places (eg. it's handy to have a nofib & a ghc build in the same
 # tree).  We can refer to "this ghc" as $(GHC_INPLACE):