diff --git a/build.sh b/build.sh
index 3729e6c..03af58c 100755
--- a/build.sh
+++ b/build.sh
@@ -2,6 +2,7 @@
 #
 # This script builds the archzfs packages in a clean clean chroot environment.
 #
+# For debug output, use DEBUG=1 ./build.sh
 
 # Defaults, don't edit these.
 PKG_LIST="spl-utils spl zfs-utils zfs"
@@ -115,14 +116,16 @@ update_pkgbuilds() {
     CUR_DEPEND_VER=${CUR_ZFS_VER}_${CUR_LINUX_VER}-$CUR_PKGREL_VER
     NEW_DEPEND_VER=${ZOL_VERSION}_${LINUX_VERSION}-$PKGREL
 
-    # echo "CUR_ZFS_VER: $CUR_ZFS_VER"
-    # echo "CUR_PKGREL_VER: $CUR_PKGREL_VER"
-    # echo "CUR_LINUX_VER: $CUR_LINUX_VER"
-    # echo "CUR_LINUX_PKGREL: $CUR_LINUX_PKGREL"
-    # echo "SED_CUR_LIN_VER: $SED_CUR_LIN_VER"
-    # echo "SED_CUR_ZFS_VER: $SED_CUR_ZFS_VER"
-    # echo "CUR_DEPEND_VER: $CUR_DEPEND_VER"
-    # echo "NEW_DEPEND_VER: $NEW_DEPEND_VER"
+    debug "ZOL_VERSION: ${ZOL_VERSION}"
+    debug "LINUX_VERSION: ${LINUX_VERSION}"
+    debug "CUR_ZFS_VER: $CUR_ZFS_VER"
+    debug "CUR_PKGREL_VER: $CUR_PKGREL_VER"
+    debug "CUR_LINUX_VER: $CUR_LINUX_VER"
+    debug "CUR_LINUX_PKGREL: $CUR_LINUX_PKGREL"
+    debug "SED_CUR_LIN_VER: $SED_CUR_LIN_VER"
+    debug "SED_CUR_ZFS_VER: $SED_CUR_ZFS_VER"
+    debug "CUR_DEPEND_VER: $CUR_DEPEND_VER"
+    debug "NEW_DEPEND_VER: $NEW_DEPEND_VER"
 
     # Change the top level PKGREL
     find . -iname "PKGBUILD" -print | xargs sed -i \
diff --git a/lib.sh b/lib.sh
index 9db3d39..87de4bd 100644
--- a/lib.sh
+++ b/lib.sh
@@ -56,3 +56,10 @@ send_email() {
         echo -e "${1}" | mutt -s "${2}" "${EMAIL}" -a "${3}" &> /dev/null;
     fi
 }
+
+debug() {
+    # $1: The message to print.
+    if [[ $DEBUG -eq 1 ]]; then
+        echo $1
+    fi
+}