Index: etc/cmake/dependencies.cmake
--- etc/cmake/dependencies.cmake.orig
+++ etc/cmake/dependencies.cmake
@@ -25,7 +25,7 @@ macro(find_dependencies)
 
   # Declare dependencies
   set(REQUIRED_DEPENDENCIES "")
-  set(OPTIONAL_DEPENDENCIES FLEX BISON OpenMP)
+  set(OPTIONAL_DEPENDENCIES FLEX OpenMP)
   set(VENDORED_DEPENDENCIES "")
 
   # Declare minimum supported version for some dependencies
@@ -156,6 +156,7 @@ macro(find_dependencies)
   endif()
 
   if(NEED_LINKING_AGAINST_LIBM)
+    list(APPEND CMAKE_REQUIRED_LIBRARIES m)
     find_library(MATH_LIBRARY m)
   endif()