1 files changed, 7 insertions, 1 deletions

diff --git a/samples/Makefile b/samples/Makefile
index 49bb11b..8cb7a98 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -13,7 +13,7 @@ define dosamples
         $(CMP) --shell-escape $1 >/dev/null
 endef
 
-all:
+all: test
         cp ../ekdosis.{lua,sty} .
         $(foreach file,$(texsamples), $(call dosamples, $(file)))
         rm -rf auto
@@ -24,4 +24,10 @@ all:
         cp -p -r .backup/* .
         rm -rf .backup
 
+test:
+        if [ ! -e ../ekdosis.sty ] || [ ! -e ../ekdosis.lua ] ;\
+        then echo "This Makefile cannot be invoked but recursively. Aborting." && exit 1 ;\
+        fi
+
+.SILENT: test
 .PHONY: all