Index: driver/Makefile.am
===================================================================
--- driver/Makefile.am	(revision 0e0f128c9f975b8eb3f6b0870c12c639668ef24c)
+++ driver/Makefile.am	(revision 7caea536e99c4221a79bc5e881998e1b468ab94f)
@@ -15,6 +15,8 @@
 ###############################################################################
 
+AUTOMAKE_OPTIONS = foreign    # do not require all the GNU file names
+
 # applies to both programs
-AM_CXXFLAGS = -Wall -O2 -g -std=c++14 -I${abs_top_srcdir}/src
+AM_CXXFLAGS = @HOST_FLAGS@ -Wall -O2 -g -std=c++14 -I${abs_top_srcdir}/src
 
 # don't install cfa directly
Index: driver/Makefile.in
===================================================================
--- driver/Makefile.in	(revision 0e0f128c9f975b8eb3f6b0870c12c639668ef24c)
+++ driver/Makefile.in	(revision 7caea536e99c4221a79bc5e881998e1b468ab94f)
@@ -213,4 +213,5 @@
 EXEEXT = @EXEEXT@
 GREP = @GREP@
+HOST_FLAGS = @HOST_FLAGS@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
@@ -298,7 +299,8 @@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
+AUTOMAKE_OPTIONS = foreign    # do not require all the GNU file names
 
 # applies to both programs
-AM_CXXFLAGS = -Wall -O2 -g -std=c++14 -I${abs_top_srcdir}/src
+AM_CXXFLAGS = @HOST_FLAGS@ -Wall -O2 -g -std=c++14 -I${abs_top_srcdir}/src
 cfa_SOURCES = cfa.cc