Use proper variables for various commands

.gitignore

@@ -15,6 +15,7 @@ config.status
 config.sub
 configure
 depcomp
+compile
 install-sh
 libtool
 ltmain.sh

Makefile.am

@@ -11,4 +11,4 @@ DISTCHECK_CONFIGURE_FLAGS = --disable-datafiles
 
 MAINTAINERCLEANFILES = Makefile.in \
 	aclocal.m4 configure config.h.in config.sub config.guess \
-	ltmain.sh depcomp missing install-sh mkinstalldirs
+	ltmain.sh depcomp compile missing install-sh mkinstalldirs

configure.ac

@@ -11,8 +11,13 @@ AM_MAINTAINER_MODE
 AC_LANG_C
 
 AC_PROG_CC
+AM_PROG_CC_C_O
 AC_PROG_CC_PIE
 AC_PROG_INSTALL
+AC_PROG_SED
+AC_PROG_AWK
+AM_PROG_MKDIR_P
+
 AC_C_RESTRICT
 
 m4_define([_LT_AC_TAGCONFIG], [])
@@ -20,6 +25,7 @@ m4_ifdef([AC_LIBTOOL_TAGS], [AC_LIBTOOL_TAGS([])])
 
 AC_DISABLE_STATIC
 AC_PROG_LIBTOOL
+AC_PROG_NM
 
 AC_ARG_ENABLE(optimization, AC_HELP_STRING([--disable-optimization],
 			[disable code optimization through compiler]), [

src/Makefile.am

@@ -36,7 +36,7 @@ plugindir = $(libdir)/ofono/plugins
 endif
 
 AM_CFLAGS = @GTHREAD_CFLAGS@ @GLIB_CFLAGS@ @GDBUS_CFLAGS@ @GATCHAT_CFLAGS@ \
-					@GISI_CFLAGS@ -DPLUGINDIR=\""$(plugindir)"\"
+				@GISI_CFLAGS@ -DPLUGINDIR=\""$(plugindir)"\"
 
 INCLUDES = -I$(top_builddir)/include -I$(top_builddir)
 
@@ -45,9 +45,10 @@ EXTRA_DIST = ofono.conf
 MAINTAINERCLEANFILES = Makefile.in
 
 ofono.exp: $(ofonod_OBJECTS)
-	$(AM_V_GEN)nm -B *.o | awk '{ print $$3 }' | sort -u | grep -E -e '^ofono_' > $@
+	$(AM_V_GEN)$(NM) $^ | $(AWK) '{ print $$3 }' | sort -u | \
+					$(EGREP) -e '^ofono_' > $@
 
 ofono.ver: ofono.exp
-	@echo "{ global:" > $@
-	$(AM_V_GEN)cat $< | sed -e "s/\(.*\)/\1;/" >> $@
-	@echo "local: *; };" >> $@
+	$(AM_V_at)echo "{ global:" > $@
+	$(AM_V_GEN)$(SED) -e "s/\(.*\)/\1;/" $< >> $@
+	$(AM_V_at)echo "local: *; };" >> $@