BTW, the unparallelized case can be optimized by only recursing first if Make
was passed a `-j` option:
```diff
diff --git a/Makefile.am b/Makefile.am
index 8cf1634..9023c10 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -176,3 +176,12 @@ EXTRA_DIST = \
wscript \
README.waf \
README.windows
+
+
+all-recursive: $(SUBDIRS)
+.PHONY: $(SUBDIRS)
+
+$(SUBDIRS):
+ @if (target_option=j; $(am__make_running_with_option)); then \
+ $(am__cd) $@ && $(MAKE) $(AM_MAKEFLAGS) all; \
+ fi
```
---
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https://github.com/geany/geany-plugins/pull/277#issuecomment-161038082
