Index: .fossil-settings/ignore-glob
==================================================================
--- .fossil-settings/ignore-glob
+++ .fossil-settings/ignore-glob
@@ -0,0 +1,2 @@
+workdir-*
+ARCHIVE

Index: build
==================================================================
--- build
+++ build
@@ -107,32 +107,48 @@
 	pkgfile="${pkgdir}/info"
 else
 	pkgfile="pkgs/${pkg}"
 	pkgdir="${pkgfile}"
 fi
-pkgdate="$(find "${pkgdir}" -type f -printf '%TY%Tm%Td%TH%TM.%TS\n' | cut -f 1-2 -d '.' | sort -n | tail -n 1)"
+
+if [ ! -e "${pkgfile}" ]; then
+	echo "Invalid package." >&2
+
+	exit 1
+fi
+
+pkgdate="$(find "${pkgdir}" -type f -printf '%TY%Tm%Td%TH%TM.%TS\n' 2>/dev/null | cut -f 1-2 -d '.' | sort -n | tail -n 1)"
 
 . "${pkgfile}"
 
 archivedir="$(pwd)/ARCHIVE"
 workdir="workdir-$$${RANDOM}${RANDOM}${RANDOM}"
-mkdir "${workdir}" "${archivedir}"
+srcfile="${archivedir}/${pkg}"
+mkdir "${archivedir}" >/dev/null 2>/dev/null
+mkdir "${workdir}" || exit 1
 cd "${workdir}" || exit 1
 workdir="$(pwd)"
 
-# Download
-## Cleanup
-rm -f src.new src
-
-## Fetch file
-wget -O src.new "${url}" || exit 1
-
-## Verify signature
-### XXX:TODO
-
-## Move file into place
-mv src.new src
+if [ ! -e "${srcfile}" ]; then
+	# Download
+	## Cleanup
+	rm -f src.new src
+
+	## Fetch file
+	wget -O src.new "${url}" || exit 1
+
+	## Verify signature
+	src_sha256="$(openssl sha256 'src.new' | sed 's@^.*= @@')"
+	if [ "${src_sha256}" != "${sha256}" ]; then
+		echo "SHA256 mismatch:  Downloaded: ${src_sha256} != Expected: ${sha256}" >&2
+
+		exit 1
+	fi
+
+	## Move file into place
+	mv src.new "${archivedir}/${pkg}"
+fi
 
 # Decompress archive
 ## Determine type of archive
 case "${url}" in
 	*.tar.xz|*.tar.xz'?'*|*.txz)
@@ -155,14 +171,14 @@
 esac
 
 ## Do decompression
 case "${decompress}" in
 	unzip)
-		unzip 'src' || die 'Unable to uncompress archive'
+		unzip "${srcfile}" || die 'Unable to uncompress archive'
 		;;
 	*)
-		"${decompress}" -dc src | tar -xf - || die 'Unable to uncompress archive'
+		"${decompress}" -dc "${srcfile}" | tar -xf - || die 'Unable to uncompress archive'
 		;;
 esac
 
 ## Cleanup source
 rm -f src

Index: pkgs/glibc
==================================================================
--- pkgs/glibc
+++ pkgs/glibc
@@ -1,11 +1,11 @@
 #! /usr/bin/env bash
 
 version=2.20
 url="http://ftp.gnu.org/gnu/glibc/glibc-${version}.tar.xz"
 domain=core.appfs.rkeene.org
-sha256=''
+sha256='f84b6d42aecc288d593c397b0a3d02260a33ee686bce0c634eb9b32798f36ba5'
 
 function configure() {
 	mkdir BUILD
 	cd BUILD
 

Index: pkgs/readline
==================================================================
--- pkgs/readline
+++ pkgs/readline
@@ -1,6 +1,6 @@
 #! /usr/bin/env bash
 
 version=6.3
 url="https://ftp.gnu.org/gnu/readline/readline-${version}.tar.gz"
 domain=core.appfs.rkeene.org
-sha256=''
+sha256='56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43'

ADDED   pkgs/zlib
Index: pkgs/zlib
==================================================================
--- /dev/null
+++ pkgs/zlib
@@ -0,0 +1,6 @@
+#! /usr/bin/env bash
+
+version=1.2.8
+url="http://zlib.net/zlib-${version}.tar.gz"
+domain=core.appfs.rkeene.org
+sha256='36658cb768a54c1d4dec43c3116c27ed893e88b02ecfcb44f2166f9c0b7f2a0d'