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-rw-r--r--Build/source/utils/asymptote/util.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/util.h b/Build/source/utils/asymptote/util.h
index 3a0241e53c9..4feb9f517a7 100644
--- a/Build/source/utils/asymptote/util.h
+++ b/Build/source/utils/asymptote/util.h
@@ -105,6 +105,7 @@ extern "C" int snprintf(char *str, size_t size, const char *format,...);
extern "C" int fileno(FILE *);
extern "C" char *strptime(const char *s, const char *format, struct tm *tm);
extern "C" int setenv(const char *name, const char *value, int overwrite);
+extern "C" int unsetenv(const char *name);
#endif
extern bool False;