$OpenBSD$

Index: cmake/Conky.cmake
--- cmake/Conky.cmake.orig
+++ cmake/Conky.cmake
@@ -96,14 +96,14 @@ set(conky_includes ${CMAKE_BINARY_DIR})
 # enabled! Thus disable this and _LARGEFILE64_SOURCE isnt needed, it is already
 # used on macOS.
 #
-if(NOT OS_DARWIN)
+if(NOT OS_DARWIN AND NOT OS_OPENBSD)
   add_definitions(-D_LARGEFILE64_SOURCE -D_POSIX_C_SOURCE=200809L) # Standard
                                                                    # definitions
   set(
     CMAKE_REQUIRED_DEFINITIONS
     "${CMAKE_REQUIRED_DEFINITIONS} -D_LARGEFILE64_SOURCE -D_POSIX_C_SOURCE=200809L"
     )
-endif(NOT OS_DARWIN)
+endif(NOT OS_DARWIN AND NOT OS_OPENBSD)
 
 if(OS_FREEBSD)
   add_definitions(-D__BSD_VISIBLE=1 -D_XOPEN_SOURCE=700)
@@ -112,6 +112,14 @@ if(OS_FREEBSD)
     "${CMAKE_REQUIRED_DEFINITIONS} -D_LARGEFILE64_SOURCE -D_POSIX_C_SOURCE=200809L -D__BSD_VISIBLE=1 -D_XOPEN_SOURCE=700"
     )
 endif(OS_FREEBSD)
+
+if(OS_OPENBSD)
+  add_definitions(-D_LARGEFILE64_SOURCE) 
+  set(
+    CMAKE_REQUIRED_DEFINITIONS
+    "${CMAKE_REQUIRED_DEFINITIONS} -D_LARGEFILE64_SOURCE"
+    )
+endif(OS_OPENBSD)
 
 if(OS_DRAGONFLY)
   set(conky_libs ${conky_libs} -L/usr/pkg/lib)