Double-quote the test cases for chflags() and lchflags()
to ensure they don't get mangled.
diff --git a/configure.in b/configure.in
index e235ebd..041d2f2 100644
--- a/configure.in
+++ b/configure.in
@@ -2591,7 +2591,7 @@
 # exit Python
 AC_MSG_CHECKING(for chflags)
 AC_CACHE_VAL(ac_cv_have_chflags,
-AC_TRY_RUN([
+AC_TRY_RUN([[
 #include <sys/stat.h>
 #include <unistd.h>
 int main(int argc, char*argv[])
@@ -2600,7 +2600,7 @@
     return 1;
   return 0;
 }
-], ac_cv_have_chflags=yes,
+]], ac_cv_have_chflags=yes,
    ac_cv_have_chflags=no,
    ac_cv_have_chflags=no)
 )
@@ -2612,7 +2612,7 @@
 
 AC_MSG_CHECKING(for lchflags)
 AC_CACHE_VAL(ac_cv_have_lchflags,
-AC_TRY_RUN([
+AC_TRY_RUN([[
 #include <sys/stat.h>
 #include <unistd.h>
 int main(int argc, char*argv[])
@@ -2621,7 +2621,7 @@
     return 1;
   return 0;
 }
-], ac_cv_have_lchflags=yes,
+]], ac_cv_have_lchflags=yes,
    ac_cv_have_lchflags=no,
    ac_cv_have_lchflags=no)
 )