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just use build-ins when C is modern enough
and other glibc defines that need enablement
diff -ru a/rc.h b/rc.h
--- a/rc.h 2025-01-05 21:16:39.487999355 +0400
+++ b/rc.h 2025-01-05 21:21:13.688559101 +0400
@@ -44,9 +44,14 @@
eError, eBreak, eReturn, eVarstack, eArena, eFifo, eFd
} ecodes;
+#if __STDC_VERSION__ <= 201710L
typedef enum bool {
FALSE, TRUE
} bool;
+#else
+#define FALSE false
+#define TRUE true
+#endif
typedef enum redirtype {
rFrom, rCreate, rAppend, rHeredoc, rHerestring
diff -ru a/configure.ac b/configure.ac
--- a/configure.ac 2025-01-05 21:33:03.952267739 +0400
+++ b/configure.ac 2025-01-05 21:33:20.702194221 +0400
@@ -1,5 +1,6 @@
dnl Our package name, version, ...
AC_INIT([rc], [1.7.4])
+AC_USE_SYSTEM_EXTENSIONS
dnl ... and release date
RELDATE=`date -I`
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