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-rw-r--r--neozip/gzread_mangle.h.in7
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diff --git a/neozip/gzread_mangle.h.in b/neozip/gzread_mangle.h.in
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+++ b/neozip/gzread_mangle.h.in
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+/* gzread_mangle.h.in -- gzgetc name mangling helper
+ * This file undefines the macro from zlib.h/zlib-ng.h to allow the real
+ * function to be defined in gzread.c. This is tricky because the prefix
+ * is not known ahead of time, thus the need for sed or similar.
+ */
+#undef @ZLIB_SYMBOL_PREFIX@gzgetc
+#undef @ZLIB_SYMBOL_PREFIX@zng_gzgetc