This prevents targets like tool_hugehelp.c from leaving around
half-constructed files if the rule fails.

Reported-by: Rafaël Carré <funman_at_videolan.org>

---
 src/Makefile.am | 3 +++
 1 file changed, 3 insertions(+)
diff --git a/src/Makefile.am b/src/Makefile.am
index 72e6772..d8c0c7d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -21,6 +21,9 @@
 ###########################################################################
 AUTOMAKE_OPTIONS = foreign nostdinc
 
+# remove targets if the command fails
+.DELETE_ON_ERROR:
+
 # Specify our include paths here, and do it relative to $(top_srcdir) and
 # $(top_builddir), to ensure that these paths which belong to the library
 # being currently built and tested are searched before the library which
-- 
2.0.1
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