Fix 'errno undeclared' compile error with older gcc versions

It looks like errno.h has to be included explicitly when compiling with older
gcc versions. This issue was encountered on the following system:
- Ubuntu 20.04 LTS
- Linux 5.4.0-156
- gcc 10.5.0
- Meson 0.53.2

diff --git a/src/timer/query.c b/src/timer/query.c
index 4298e7a58287f858ecd9557d1358117e4a64b515..23f724775b723a3ff4e86f26eeaf9291572e5521 100644 (file)
--- a/src/timer/query.c
+++ b/src/timer/query.c
@@ -10,6 +10,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <stdbool.h>
+#include <errno.h>
 
 #include <time.h>