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At one point in the configure script locate(1) is used to find the python header file. It is assumed that the result of this command is a single line and sed(1) is used to remove the header file name to yield a python include directory. This fails if locate(1) returns more than one line. Returning more than one line is certainly possible, for example, if multiple versions of python are installed.

The patch below offers one expedient solution to the problem: clip the output of locate(1) to a single line using head(1). This will have no effect on systems for which locate(1) already produces only one line of output.

--- acinclude.m4.orig
+++ acinclude.m4
@@ -793,7 +802,7 @@
         python_prefix=/System/Library/Frameworks/Python.framework/*/
       fi
       AC_CHECK_HEADER([$ax_python_bin/Python.h],
-      [[ax_python_header=@locate $python_prefix$ax_python_bin/Python.h | sed -e s,/Python.h~@]],
+      [[ax_python_header=@locate $python_prefix$ax_python_bin/Python.h | head -1 | sed -e s,/Python.h~@]],
       ax_python_header=no)
       if test $ax_python_lib != no; then
         if test $ax_python_header != no; then