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nixpkgs/pkgs/development/compilers/souper/cmake-fix.patch

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--- souper-1be75fe6a96993b57dcba038798fe6d1c7d113eb-src/CMakeLists.txt.orig 2017-01-20 13:55:14.783632588 -0600
+++ souper-1be75fe6a96993b57dcba038798fe6d1c7d113eb-src/CMakeLists.txt 2017-01-20 13:55:20.505728456 -0600
@@ -33,7 +33,10 @@
OUTPUT_VARIABLE LLVM_SYSTEM_LIBS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
-set(LLVM_LIBS "${LLVM_LIBS} ${LLVM_SYSTEM_LIBS}")
+
+if (LLVM_SYSTEM_LIBS)
+ set(LLVM_LIBS "${LLVM_LIBS} ${LLVM_SYSTEM_LIBS}")
+endif()
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --ldflags