# use for gmx::compat::optional. These are included as system
# headers so that no warnings are issued from them.
target_include_directories(${EXENAME} SYSTEM PRIVATE ${PROJECT_SOURCE_DIR}/src/external)
+ target_include_directories(${EXENAME} SYSTEM PRIVATE ${PROJECT_SOURCE_DIR}/src/external/muparser)
if(CYGWIN)
# Ensure GoogleTest headers can find POSIX things needed
target_compile_definitions(${EXENAME} PRIVATE _POSIX_C_SOURCE=200809L)