Removed the default prefix of /usr, which makes the default prefix
/usr/local.  This breaks backwards compatibility with various
documentation, videos, etc., but conforms with standard Linux
practices, however misguided they may be.  Once the open_pdks
Sky130 distribution becomes a package (which is inevitable, given
how long the installation takes), then the documented /usr/share/
will be correct anyway.
diff --git a/scripts/configure.ac b/scripts/configure.ac
index 244bd6c..15afffb 100755
--- a/scripts/configure.ac
+++ b/scripts/configure.ac
@@ -1,6 +1,6 @@
 AC_INIT([open_pdks], [1.0], [github.com/RTimothyEdwards/open_pdks])
 
-AC_PREFIX_DEFAULT(/usr)
+# AC_PREFIX_DEFAULT(/usr)
 AC_CONFIG_MACRO_DIR(m4)
 
 ## REQUIRES: https://www.gnu.org/software/autoconf-archive/ax_python_module.html#ax_python_module