Port the build-time command generator to Python 3, remove a malformed
autoconf probe, and make installed wrapper configuration refer to installed
headers and libraries without embedding the package build flags.

--- a/configure.in
+++ b/configure.in
@@ -16,7 +16,6 @@ AC_HEADER_STDC
 #  change for Debian (CUS)
 #AC_PROG_RANLIB
 AC_PROG_LIBTOOL
-AC_INCLUDES_DEFAULT
 
 AC_PATH_PROGS(PERL,   perl perl5 perl5.8 perl5.6 perl5.005, NO_PERL )
 AC_PATH_PROGS(PYTHON, python python2 python2.5 python2.4 python2.3 python2.2 python2.1, NO_PYTHON)

--- a/configure
+++ b/configure
@@ -3353,6 +3353,3 @@ fi
 done
-
-
-$ac_includes_default
 
 for ac_prog in perl perl5 perl5.8 perl5.6 perl5.005
 do

--- a/src/lib/ComBuild
+++ b/src/lib/ComBuild
@@ -1,8 +1,8 @@
-#!/usr/bin/python 
+#!/usr/bin/env python3
 #
 #  build ifeffit's build.h file
 #  copyright (c) 2002  matt newville
 #
-import string, sys
+import sys
 
 try:
     keywords = sys.argv[1]
@@ -14,7 +14,7 @@
 indent   = " " * 5
 
 def readfile(file):
-    print " Reading %s " % file
+    print(" Reading %s " % file)
     f = open(file,'r')
     l = f.readlines()
     f.close()
@@ -25,11 +25,10 @@
 for i in kw:
     j = i.strip()
     if ((len(j) > 5) and (j[0] != '#')):
-        (x, y) = string.split(i,'::')
+        (x, y) = i.split('::', 1)
         coms[x] = y.strip()
 
-k  = coms.keys()
-k.sort()
+k = sorted(coms)
 
 file = comfile
 f = open(file,'w')
@@ -44,5 +43,5 @@
 
 f.write("c}\n")
 f.close()
-print " Wrote %s " % file
+print(" Wrote %s " % file)
 
--- a/src/lib/Makefile.in
+++ b/src/lib/Makefile.in
@@ -489,10 +489,10 @@ Config.mak: $(OBJECTS)
 	@echo '#    LIB_F77 = Fortran libraries'     >> $@
 	@echo '#    LIB_X11 = X Libaries'            >> $@
 	@echo '#    INC_IFF = location of ifeffit.h' >> $@
-	@echo 'LIB_IFF  = -L$(prefix)/lib -lifeffit' >> $@
+	@echo 'LIB_IFF  = -lifeffit'                  >> $@
 	@echo 'LIB_PLT  = $(PGPLOT_LIBS)'            >> $@
 	@echo 'LIB_F77  = $(MN_FLIBS) '              >> $@
-	@echo 'INC_IFF  = -I$(pkgdatadir)/config'    >> $@
+	@echo 'INC_IFF  = -I$(includedir) -I$(pkgdatadir)/config' >> $@
 	@echo '#==  ' >> $@
 	@echo 'made $@'
 
@@ -526,7 +526,7 @@ Makefile.PL: Config.mak
 	@echo "              'INSTALLSCRIPT' => '$(bindir)',">> $@
 	@echo "              'LDDLFLAGS'     => '$(LDDLFLAGS_P5)',"  >> $@
-	@echo "              'INC'    => '-I../../src/lib -I$(pkgdatadir)/config'," >> $@
-	@echo "              'LIBS'   =>[' -L../../src/lib '.\$$Config{ldflags}." >> $@
+	@echo "              'INC'    => '-I$(includedir) -I$(pkgdatadir)/config'," >> $@
+	@echo "              'LIBS'   =>[' '.\$$Config{ldflags}." >> $@
 	@echo "                    ' -lifeffit $(PGPLOT_LIBS) '." >> $@
 	@echo "                    join(\" \", (sort(split(\" \", \"$(MN_FLIBS)\" ))))] " >> $@
 	@echo "         );" >> $@
@@ -544,2 +544,2 @@ site_install.py: Config.mak
-	@echo 'bin_dir="$(bindir)"' > $@
-	@echo 'lib_iff="-L../../src/lib -lifeffit "' >> $@
+	@echo 'bin_dir="$(bindir)"' >> $@
+	@echo 'lib_iff="-lifeffit "' >> $@
@@ -548 +548 @@ site_install.py: Config.mak
-	@echo 'inc_iff="-I../../src/lib -I$(pkgdatadir)/config"' >> $@
+	@echo 'inc_iff="-I$(includedir) -I$(pkgdatadir)/config"' >> $@
@@ -560,5 +560,2 @@ TclSetup.in: Config.mak
-	@echo 'LIB_IFF  = -L../../src/lib -lifeffit ' >> $@
-	@echo 'INC_IFF  = -I../../src/lib -I$(pkgdatadir)/config' >> $@
+	@echo 'LIB_IFF  = -lifeffit ' >> $@
+	@echo 'INC_IFF  = -I$(includedir) -I$(pkgdatadir)/config' >> $@
-	@echo 'CC       = $(CCLD)'     >> $@
-	@echo 'CFLAGS   = $(CFLAGS)'   >> $@
-	@echo 'LDFLAGS  = $(LDFLAGS)'  >> $@