Include sys/param.h if present.

Needed for howmany() on MUSL systems such as Alpine.

configure.ac

@@ -456,6 +456,7 @@ AC_CHECK_HEADERS([ \
 	sys/mman.h \
 	sys/label.h \
 	sys/ndir.h \
+	sys/param.h \
 	sys/poll.h \
 	sys/prctl.h \
 	sys/procctl.h \

openbsd-compat/bsd-poll.c

@@ -19,6 +19,9 @@
 
 #include <sys/types.h>
 #include <sys/time.h>
+#ifdef HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
 #ifdef HAVE_SYS_SELECT_H
 # include <sys/select.h>
 #endif