implement build system based on redo

.gitignore

+.redo

build.do

+redo-ifchange manpages

clean.do

+. ./conf
+
+rm $MAN_1_PAGES $MAN_5_PAGES

conf

+MAN_5_PAGES="alint.5.man"
+MAN_1_PAGES="apkbuild-lint.1.man aports-lint.1.man"
+BINARIES="apkbuild-lint aports-lint"

default.man.do

+scdoc <"$2".scd >$3

install.do

+. ./conf
+
+: ${DESTDIR:=NONE}
+: ${PREFIX:=/usr}
+: ${MANDIR:=$DESTDIR$PREFIX/share/man}
+: ${BINDIR:=$DESTDIR$PREFIX/bin}
+
+if [ "$DESTDIR" = "NONE" ]; then
+	echo "$0: fatal: set DESTDIR before trying to install." >&2
+	exit 99
+fi
+
+redo-ifchange build
+
+for page in $MAN_1_PAGES
+do
+    install -Dm0644 "$page" "$MANDIR"/man1/"${page%*.man}"
+done
+
+for page in $MAN_5_PAGES
+do
+    install -Dm0644 "$page" "$MANDIR"/man5/"${page%*.man}"
+done
+
+for binary in $BINARIES
+do
+    install -Dm0755 "$binary" "$BINDIR/$binary"
+done

manpages.do

+. ./conf
+
+redo-ifchange $MAN_1_PAGES $MAN_5_PAGES