Small fix.

benchmarklib/Makefile

@@ -12,7 +12,7 @@ impl:
 	pushd benchmarklib && \
 	CXX=$$(which c++) cmake -DSTATIC=1 -DBOOST_ROOT=/opt/cppse/build/boost . && \
 	make -j $$(nproc) && \
-	make install && \
+	make install
 
 package:
 	rm -rf out