[Rd] Bug with zlib version checking for zlib >= 1.2.10, R version 3.3.2

[Justin Bedő]

Hi,

Posting here as bugzilla is closed to registration.
The zlib version checking code does not handle double digits for the
patch version in the semantic versioning scheme. Consequently, a
./configure fails when using a zlib version ≥ 1.5.10. I suggest
something like the following patch:

--- a/m4/R.m4
+++ b/m4/R.m4
@@ -3116,7 +3116,7 @@ int main() {
 #ifdef ZLIB_VERSION
 /* Work around Debian bug: it uses 1.2.3.4 even though there was no such
    version on the master site zlib.net */
-  exit(strncmp(ZLIB_VERSION, "1.2.5", 5) < 0);
+  exit(strncmp(ZLIB_VERSION, "1.2.5", 5) < 0 && (strlen(ZLIB_VERSION) < 6 || strncmp(ZLIB_VERSION, "1.2.10", 6) < 0));
 #else
   exit(1);
 #endif

This could of course be improved to properly parse the string.

Cheers,

Justin
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