diff --git a/sc2/build/unix/build_clean b/sc2/build/unix/build_clean
index 51ed1231e..ffc744050 100644
--- a/sc2/build/unix/build_clean
+++ b/sc2/build/unix/build_clean
@@ -1,5 +1,8 @@
 #!/bin/sh
 
+# Find all the .c, .cpp, .m, and .rc files which are relevant for the project,
+# and remove their respective object files in the work directory.
+
 # Expected to be passed from the environment:
 # BUILD_PROJECT - the name of the project
 # BUILD_ROOT - The root of the source files.
@@ -9,48 +12,18 @@ BUILD_ROOT=${BUILD_ROOT%/}/
 BUILD_WORK=${BUILD_WORK%/}/
 eval OBJDIR=\"${BUILD_WORK}\${${BUILD_PROJECT}_OBJS}\"
 
-
-# $1 - The prefix up to this point
-# $2 - The name of the current subdir
-recurse_subdir() {
-	local REC_PREFIX SUBDIRS SUBDIR CFILES CXXFILES MFILES RCFILES FILE
-	eval local ${BUILD_PROJECT}_CFILES ${BUILD_PROJECT}_CXXFILES \
-			${BUILD_PROJECT}_MFILES ${BUILD_PROJECT}_RCFILES \
-			${BUILD_PROJECT}_SUBDIRS
-
-	REC_PREFIX="$1$2/"
-	if [ "$REC_PREFIX" = "/" ]; then
-		REC_PREFIX=
-	fi
-	
-	eval ${BUILD_PROJECT}_CFILES=
-	eval ${BUILD_PROJECT}_CXXFILES=
-	eval ${BUILD_PROJECT}_MFILES=
-	eval ${BUILD_PROJECT}_RCFILES=
-	eval ${BUILD_PROJECT}_SUBDIRS=
-
-	. "${BUILD_ROOT}${REC_PREFIX}Makeinfo"
-
-	eval CFILES=\$${BUILD_PROJECT}_CFILES
-	eval CXXFILES=\$${BUILD_PROJECT}_CXXFILES
-	eval MFILES=\$${BUILD_PROJECT}_MFILES
-	eval RCFILES=\$${BUILD_PROJECT}_RCFILES
-	for FILE in $CFILES $CXXFILES $MFILES $RCFILES; do
-		rm -f -- "${OBJDIR}${REC_PREFIX}$FILE.d" \
-				"${OBJDIR}${REC_PREFIX}$FILE.o"
-	done
-
-	eval SUBDIRS=\$${BUILD_PROJECT}_SUBDIRS
-	for SUBDIR in $SUBDIRS; do
-		recurse_subdir "$REC_PREFIX" "$SUBDIR"
-	done
-
-	rmdir -- "${OBJDIR}${REC_PREFIX%/}" 2> /dev/null
-}
-
-
 . "${BUILD_ROOT}Makeproject"
 
-recurse_subdir "" ""
-
+build/unix/recurse "$BUILD_PROJECT" "$BUILD_ROOT" | \
+		while read TYPE FILE; do
+	case "$TYPE" in
+		C|CXX|M|RC)
+			rm -f -- "${OBJDIR}${REC_PREFIX}$FILE.d" \
+					"${OBJDIR}${FILE}.o"
+			;;
+		DIROUT)
+			rmdir -- "${OBJDIR}${FILE}" 2> /dev/null
+			;;
+	esac
+done
 
diff --git a/sc2/build/unix/build_collect b/sc2/build/unix/build_collect
index 5e9612e7f..7a5dcb9b7 100644
--- a/sc2/build/unix/build_collect
+++ b/sc2/build/unix/build_collect
@@ -1,5 +1,8 @@
 #!/bin/sh
 
+# Find all the .c, .cpp, .m, and .rc files which are relevant for the project,
+# and map them to the work directory.
+
 # Expected to be passed from the environment:
 # BUILD_PROJECT - the name of the project
 # BUILD_ROOT - The root of the source files.
@@ -9,45 +12,15 @@ BUILD_ROOT=${BUILD_ROOT%/}/
 BUILD_WORK=${BUILD_WORK%/}/
 eval OBJDIR=\"${BUILD_WORK}\${${BUILD_PROJECT}_OBJS}\"
 
-
-# $1 - The prefix up to this point
-# $2 - The name of the current subdir
-recurse_subdir() {
-	local REC_PREFIX SUBDIRS SUBDIR CFILES CXXFILES MFILES RCFILES FILE
-	eval local ${BUILD_PROJECT}_CFILES ${BUILD_PROJECT}_CXXFILES \
-			${BUILD_PROJECT}_MFILES ${BUILD_PROJECT}_RCFILES \
-			${BUILD_PROJECT}_SUBDIRS
-
-	REC_PREFIX="$1$2/"
-	if [ "$REC_PREFIX" = "/" ]; then
-		REC_PREFIX=
-	fi
-	
-	eval ${BUILD_PROJECT}_CFILES=
-	eval ${BUILD_PROJECT}_CXXFILES=
-	eval ${BUILD_PROJECT}_MFILES=
-	eval ${BUILD_PROJECT}_RCFILES=
-	eval ${BUILD_PROJECT}_SUBDIRS=
-
-	. "${BUILD_ROOT}${REC_PREFIX}Makeinfo"
-
-	eval CFILES=\$${BUILD_PROJECT}_CFILES
-	eval CXXFILES=\$${BUILD_PROJECT}_CXXFILES
-	eval MFILES=\$${BUILD_PROJECT}_MFILES
-	eval RCFILES=\$${BUILD_PROJECT}_RCFILES
-	for FILE in $CFILES $CXXFILES $MFILES $RCFILES; do
-		echo "${OBJDIR}${REC_PREFIX}$FILE"
-	done
-
-	eval SUBDIRS=\$${BUILD_PROJECT}_SUBDIRS
-	for SUBDIR in $SUBDIRS; do
-		recurse_subdir "$REC_PREFIX" "$SUBDIR"
-	done
-}
-
-
 . "${BUILD_ROOT}Makeproject"
 . "${BUILD_WORK}build.vars"
 
-recurse_subdir "" ""
+build/unix/recurse "$BUILD_PROJECT" "$BUILD_ROOT" | \
+		while read TYPE FILE; do
+	case "$TYPE" in
+		C|CXX|M|RC)
+			echo "$OBJDIR$FILE"
+			;;
+	esac
+done