Point to mdb.c for docs on macros in Makefile

diff --git a/libraries/liblmdb/Makefile b/libraries/liblmdb/Makefile
index 30d2202428df36b5809b144c17c65189138d7114..2cef357fda041837ed7c5ba2680ac8e445b997b1 100644 (file)
--- a/libraries/liblmdb/Makefile
+++ b/libraries/liblmdb/Makefile
@@ -5,29 +5,16 @@
 #
 # Preprocessor macros (for CPPFLAGS) of interest...
 # Note that the defaults should already be correct for most
-# platforms; you should not need to change any of these:
+# platforms; you should not need to change any of these.
+# Read their descriptions in mdb.c if you do:
 #
-# To compile successfully if the default does not:
-# - MDB_USE_POSIX_SEM  (enabled by default on BSD, Apple)
-#      Define if shared mutexes are unsupported.  Note that Posix
-#      semaphores and shared mutexes have different behaviors and
-#      different problems, see the Caveats section in lmdb.h.
-#
-# For best performance or to compile successfully:
-# - MDB_DSYNC = "O_DSYNC" (default) or "O_SYNC" (less efficient)
-#      If O_DSYNC is undefined but exists in /usr/include,
-#      preferably set some compiler flag to get the definition.
-# - MDB_FDATASYNC = "fdatasync" or "fsync"
-#      Function for flushing the data of a file. Define this to
-#      "fsync" if fdatasync() is not supported. fdatasync is
-#      default except on BSD, Apple, Android which use fsync.
+# - MDB_USE_POSIX_SEM
+# - MDB_DSYNC
+# - MDB_FDATASYNC
 # - MDB_USE_PWRITEV
-#      Define if the pwritev() function is supported.
 #
-# Data format:
-# - MDB_MAXKEYSIZE
-#      Controls data packing and limits, see mdb.c.
-#      You might need to change this if the default size is too small.
+# There may be other macros in mdb.c of interest. You should
+# read mdb.c before changing any of them.
 #
 CC     = gcc
 W      = -W -Wall -Wno-unused-parameter -Wbad-function-cast