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-rw-r--r--config/cmake/ConfigureChecks.cmake4
1 files changed, 3 insertions, 1 deletions
diff --git a/config/cmake/ConfigureChecks.cmake b/config/cmake/ConfigureChecks.cmake
index a004c76..7981b64 100644
--- a/config/cmake/ConfigureChecks.cmake
+++ b/config/cmake/ConfigureChecks.cmake
@@ -224,7 +224,9 @@ if (CMAKE_SYSTEM_NAME MATCHES "Linux")
# functionality so clock_gettime and CLOCK_MONOTONIC are defined
# correctly. This was later updated to 200112L so that
# posix_memalign() is visible for the direct VFD code on Linux
- # systems.
+ # systems. Even later, this was changed to 200809L to support
+ # pread/pwrite in VFDs.
+ #
# POSIX feature information can be found in the gcc manual at:
# http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
set (HDF_EXTRA_C_FLAGS -D_POSIX_C_SOURCE=200809L)