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-rw-r--r--config.h.pre6
1 files changed, 6 insertions, 0 deletions
diff --git a/config.h.pre b/config.h.pre
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index 00000000..a309ed95
--- /dev/null
+++ b/config.h.pre
@@ -0,0 +1,6 @@
+#ifndef MANDOC_CONFIG_H
+#define MANDOC_CONFIG_H
+
+#if defined(__linux__) || defined(__MINT__)
+# define _GNU_SOURCE /* strptime(), getsubopt() */
+#endif