Rewrote configure.in and replaced header.in with one generated by autoheader, added copyright notice to all source files as per GNU standards, and changed "pv --version" output to conform to GNU standards.

generate.sh

@@ -1,30 +1,42 @@
 #!/bin/sh
 #
-# Script to autogenerate the `configure' script, and rebuild the dependency
-# list.
+# Script to autogenerate the `configure' script, and the config header
+# template if `autoconf' is available, and then rebuild the dependency list.
 
 set -e
 
-cd `dirname $0`
+cd $(dirname $0)
 
-cd autoconf
-autoconf configure.in > ../configure
-cd ..
+test -t 1 && echo "${0##*/}: running autoconf"
+autoconf autoconf/configure.in > configure
 chmod 755 configure
 
+if command -v autoheader >/dev/null; then
+	test -t 1 && echo "${0##*/}: running autoheader"
+	autoheader autoconf/configure.in
+else
+	test -t 1 && echo "${0##*/}: autoheader not found, skipping"
+fi
+
 echo > autoconf/make/depend.mk~
 echo > autoconf/make/filelist.mk~
 echo > autoconf/make/modules.mk~
 
 MAKE=make
-which gmake >/dev/null 2>&1 && MAKE=gmake
+command -v gmake >/dev/null 2>&1 && MAKE=gmake
 
 rm -rf .gen
 mkdir .gen
 cd .gen
+
+test -t 1 && echo "${0##*/}: running new \`configure' script"
 sh ../configure
+
+test -t 1 && echo "${0##*/}: regenerating Makefile fragments"
 $MAKE make
 $MAKE dep
+
+test -t 1 && echo "${0##*/}: cleaning up"
 cd ..
 rm -rf .gen
 rm -rf autoconf/autom4te.cache