Makefile: support building multiple files with one config option

extensions/GNUmakefile.in

@@ -45,16 +45,14 @@ endif
 #
 include ${top_srcdir}/mconfig
 -include ${top_srcdir}/mconfig.*
-pfx_all_mod   := $(patsubst ${srcdir}/libxt_%.c,%,$(wildcard ${srcdir}/libxt_*.c))
-pfx_build_mod := $(foreach i,${pfx_all_mod},$(if ${build_${i}},${i},))
-pfx_solibs    := $(patsubst %,libxt_%.so,${pfx_build_mod})
+include ${srcdir}/Mbuild
 
 
 #
 #	Building blocks
 #
-targets := ${pfx_solibs}
-targets_install := ${pfx_solibs}
+targets := ${obj-m}
+targets_install := ${obj-m}
 
 .SECONDARY:
 

extensions/Mbuild

@@ -0,0 +1,8 @@
+obj-${build_CHAOS}    += libxt_CHAOS.so
+obj-${build_DELUDE}   += libxt_DELUDE.so
+obj-${build_ECHO}     += libxt_ECHO.so
+obj-${build_LOGMARK}  += libxt_LOGMARK.so
+obj-${build_TARPIT}   += libxt_TARPIT.so
+obj-${build_TEE}      += libxt_TEE.so
+obj-${build_geoip}    += libxt_geoip.so
+obj-${build_portscan} += libxt_portscan.so

mconfig

@@ -1,8 +1,5 @@
 # -*- Makefile -*-
 #
-# Only "build_${name}=m" (build extensions) or "build_${name}="
-# (do not build) are valid!
-#
 build_CHAOS=m
 build_DELUDE=m
 build_ECHO=