+if [ -z "${CXXFLAGS}" ] && [ -r Makefile ]; then
+ sed -n -e ':loop
+/\\$/ N
+s/\\\n//g
+t loop
+/^CXXFLAGS[ ]*=/ s/CXXFLAGS[ ]*=[ ]*\(.*\)/\1/p' < Makefile > Makefile.cc
+ CXXFLAGS=`tail -1 Makefile.cc`
+ rm -f Makefile.cc
+fi
+
+# Generate a default definition for YACC. This is used if the makefile can't
+# locate bison or byacc in objdir.
+
+for prog in 'bison -y' byacc yacc
+do
+ set dummy $prog; tmp=$2
+ IFS="${IFS= }"; save_ifs="$IFS"; IFS="${IFS}:"
+ for dir in $PATH; do
+ test -z "$dir" && dir=.
+ if test -f $dir/$tmp; then
+ DEFAULT_YACC="$prog"
+ break
+ fi
+ done
+ IFS="$save_ifs"
+
+ test -n "$DEFAULT_YACC" && break
+done
+
+# Generate a default definition for M4. This is used if the makefile can't
+# locate m4 in objdir.
+
+for prog in gm4 gnum4 m4
+do
+ set dummy $prog; tmp=$2
+ IFS="${IFS= }"; save_ifs="$IFS"; IFS="${IFS}:"
+ for dir in $PATH; do
+ test -z "$dir" && dir=.
+ if test -f $dir/$tmp; then
+ DEFAULT_M4="$prog"
+ break
+ fi
+ done
+ IFS="$save_ifs"
+
+ test -n "$DEFAULT_M4" && break
+done
+
+# Generate a default definition for LEX. This is used if the makefile can't
+# locate flex in objdir.
+
+for prog in flex lex
+do
+ set dummy $prog; tmp=$2
+ IFS="${IFS= }"; save_ifs="$IFS"; IFS="${IFS}:"
+ for dir in $PATH; do
+ test -z "$dir" && dir=.
+ if test -f $dir/$tmp; then
+ DEFAULT_LEX="$prog"
+ break
+ fi
+ done
+ IFS="$save_ifs"
+
+ test -n "$DEFAULT_LEX" && break
+done
+