diff --git a/make/doxygen.mk b/make/doxygen.mk
index 84c89dad..86cfb627 100644
--- a/make/doxygen.mk
+++ b/make/doxygen.mk
@@ -40,18 +40,18 @@ html: doxygen.done cpfiles.done
 
 
 %: %.tmpl
-	cat $< \
-		| sed "s/__VERSION__/$(DIST_VERSION)/" \
-		| sed "s/__PROJECT__/$(PROJECT)/" \
-		| sed "s/__PROJECT_CAPNAME__/$(PROJECT_CAPNAME)/" \
-		| sed "s/__OUTPUT_DIR__/$(OUTPUT_DIR)/" \
-		| sed "s%__PROJECT_TOPDIR__%$(TOPDIR)%" \
-		| sed "s%__FILE_PATTERNS__%$(DOC_FILE_PATTERNS)%" \
-		| sed "s%__INPUT_DIRS__%$(DOC_INPUT_DIRS)%" \
-		| sed "s%__SRC_IS_JAVA__%$(DOC_SRC_IS_JAVA)%" \
-		| sed "s%__EXCLUDE_FILES__%$(DOC_EXCLUDE_FILES)%" \
-		| sed "s%__INCLUDE_PATH__%$(DOC_INCLUDE_PATH)%" \
-	> $@
+	sed " \
+		s/__VERSION__/$(DIST_VERSION)/; \
+		s/__PROJECT__/$(PROJECT)/; \
+		s/__PROJECT_CAPNAME__/$(PROJECT_CAPNAME)/; \
+		s/__OUTPUT_DIR__/$(OUTPUT_DIR)/; \
+		s%__PROJECT_TOPDIR__%$(TOPDIR)%; \
+		s%__FILE_PATTERNS__%$(DOC_FILE_PATTERNS)%; \
+		s%__INPUT_DIRS__%$(DOC_INPUT_DIRS)%; \
+		s%__SRC_IS_JAVA__%$(DOC_SRC_IS_JAVA)%; \
+		s%__EXCLUDE_FILES__%$(DOC_EXCLUDE_FILES)%; \
+		s%__INCLUDE_PATH__%$(DOC_INCLUDE_PATH)%; \
+	" $< > $@
 
 doxygen.done: $(UNTEMPLATED)
 	umask 022; doxygen $(DOXYGEN_CONF)