diff -Naur libspectrum-1.4.4/configure.ac libspectrum-1.4.4-patched/configure.ac
--- libspectrum-1.4.4/configure.ac	2018-07-01 02:07:44.000000000 +0200
+++ libspectrum-1.4.4-patched/configure.ac	2020-07-28 16:38:22.636459194 +0200
@@ -113,14 +113,6 @@
 dnl Check for functions
 AC_CHECK_FUNCS(_snprintf _stricmp _strnicmp snprintf strcasecmp strncasecmp)
 
-dnl Allow the user to say that various libraries are in one place
-AC_ARG_WITH(local-prefix,
-[  --with-local-prefix=PFX local libraries installed in PFX (optional)],
-CPPFLAGS="$CPPFLAGS -I$withval/include"; LDFLAGS="$LDFLAGS -L$withval/lib",
-if test "$prefix" != "NONE"; then
-  CPPFLAGS="$CPPFLAGS -I$prefix/include"; LDFLAGS="$LDFLAGS -L$prefix/lib"
-fi)
-
 dnl Check whether to use zlib (the UNIX version is called z, Win32 zdll)
 AC_MSG_CHECKING(whether to use zlib)
 AC_ARG_WITH(zlib,