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-rw-r--r--libcrystfel/CMakeLists.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/libcrystfel/CMakeLists.txt b/libcrystfel/CMakeLists.txt
index aea75b27..69668a8c 100644
--- a/libcrystfel/CMakeLists.txt
+++ b/libcrystfel/CMakeLists.txt
@@ -3,7 +3,7 @@ project(libcrystfel VERSION ${CRYSTFEL_SHORT_VERSION} LANGUAGES C)
pkg_check_modules(XGANDALF xgandalf)
pkg_check_modules(PINKINDEXER pinkIndexer)
pkg_check_modules(FDIP fdip)
-find_package(ZLIB REQUIRED)
+find_package(ZLIB)
find_package(FLEX REQUIRED)
find_package(BISON REQUIRED)
pkg_check_modules(MSGPACK msgpack)
@@ -18,6 +18,7 @@ set(HAVE_PINKINDEXER ${PINKINDEXER_FOUND})
set(HAVE_FDIP ${FDIP_FOUND})
set(HAVE_MSGPACK ${MSGPACK_FOUND})
set(HAVE_LIBCCP4 ${LIBCCP4_FOUND})
+set(HAVE_ZLIB ${ZLIB_FOUND})
# Recent enough version of zlib?
set(CMAKE_REQUIRED_LIBRARIES "-lz")