build/pkgs/mathjax: add spkg-configure file

Author: orlitzky

build/pkgs/mathjax/spkg-configure.m4

@@ -0,0 +1,26 @@
+SAGE_SPKG_CONFIGURE([mathjax], [
+  # Arch:   /usr/share/mathjax
+  # Gentoo: /usr/share/mathjax
+  # Void:   /usr/share/mathjax
+  AC_MSG_CHECKING([for MathJax-3.x])
+  m4_foreach([mathjax_dir], [/usr/share/mathjax], [
+    # tex-chtml.hs is used in src/sage_docbuild/conf.py
+    # and was not present in MathJax-2.x
+    AS_IF([test -f "mathjax_dir/tex-chtml.js"], [
+      SAGE_MATHJAX_DIR="mathjax_dir"
+      AC_MSG_RESULT([mathjax_dir])
+    ])
+  ])
+  AS_IF([test -z "${SAGE_MATHJAX_DIR}"], [
+    AC_MSG_RESULT([no])
+    sage_spkg_install_mathjax=yes
+  ])
+],[],[],[
+  # post-check
+  AS_IF([test x$sage_spkg_install_mathjax = xyes], [
+    # Our spkg-src script adds an extra "mathjax"
+    SAGE_MATHJAX_DIR='${prefix}'/share/mathjax/mathjax
+  ])
+
+  AC_SUBST(SAGE_MATHJAX_DIR, "${SAGE_MATHJAX_DIR}")
+])