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diff -ru isync-1.4.4.orig/configure isync-1.4.4/configure
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--- isync-1.4.4.orig/configure	2021-12-03 11:56:24.000000000 +0100
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+++ isync-1.4.4/configure	2021-12-08 13:22:51.039227486 +0100
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@@ -4534,52 +4534,6 @@
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 fi
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-if test "$GCC" = yes; then
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-    warnings="
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-        -Wall -Wextra
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-        -Wshadow
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-        -Wcast-qual
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-        -Wformat=2 -Wformat-signedness -Wformat-nonliteral
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-        -Wstrict-prototypes
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-
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-        -Wno-overlength-strings
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-    "
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-    CFLAGS="$CFLAGS -pipe -std=c11 -pedantic $(echo $warnings)"
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-fi
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-
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-
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-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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-/* end confdefs.h.  */
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-
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-void fkt(void)
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-{
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-    int a = 42;  // c99 comment
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-
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-    for (int i = 0; i < a; i++) {}  // declaration inside for()
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-    int b;  // declaration after code
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-}
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-
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-// c11 anonymous structs/unions
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-struct base {
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-    int a;
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-};
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-union deriv {
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-    struct base gen;
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-    struct {
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-        int a;
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-        int b;
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-    };
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-};
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-
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-_ACEOF
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-if ac_fn_c_try_compile "$LINENO"
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-then :
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-
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-else $as_nop
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-  as_fn_error $? "compiler does not support required C11 features" "$LINENO" 5
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-fi
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-rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
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-
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 CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
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 # Extract the first word of "perl", so it can be a program name with args.