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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Missing include for time.h in reduce_stddev.c","articleBody":"The reduce_stddev.c example is missing an include directive for the header \u003ctime.h\u003e.\n\nRunning make results in the following error:\n\n```mpicc -o reduce_stddev reduce_stddev.c -lm\nreduce_stddev.c: In function ‘main’:\nreduce_stddev.c:43:9: error: implicit declaration of function ‘time’ [-Wimplicit-function-declaration]\n   43 |   srand(time(NULL)*world_rank); // Seed the random number generator of processes uniquely\n      |         ^~~~\nreduce_stddev.c:15:1: note: ‘time’ is defined in header ‘\u003ctime.h\u003e’; this is probably fixable by adding ‘#include \u003ctime.h\u003e’\n   14 | #include \u003cassert.h\u003e\n  +++ |+#include \u003ctime.h\u003e\n   15 | \nmake: *** [makefile:10: reduce_stddev] Error 1```","author":{"url":"https://github.com/melroy-tellis","@type":"Person","name":"melroy-tellis"},"datePublished":"2026-01-06T19:42:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/115/mpitutorial/issues/115"}