Hello, During 'configure' of the MonetDB4 module (Stable branch, MonetDB_4-20), I got the warning: configure: WARNING: fcntl.h: present but cannot be compiled configure: WARNING: fcntl.h: check for missing prerequisite headers? configure: WARNING: fcntl.h: see the Autoconf documentation configure: WARNING: fcntl.h: section "Present But Cannot Be Compiled" configure: WARNING: fcntl.h: proceeding with the preprocessor's result configure: WARNING: fcntl.h: in the future, the compiler will take precedence The same warning was given about several other header files, e.g. limits.h, pwd.h, time.h, sys/time.h, utime.h, ... The compilation was finished without further problems, but I would like to know why I got these warnings, since this is something new. Thanks! Jennie