diff -up asymptote-2.89/configure.ac.flexiblas asymptote-2.89/configure.ac
--- asymptote-2.89/configure.ac.flexiblas	2024-03-25 15:31:54.720461592 -0400
+++ asymptote-2.89/configure.ac	2024-03-25 15:34:54.088301165 -0400
@@ -439,7 +439,8 @@ AC_ARG_ENABLE(gsl,
 
 if test "x$enable_gsl" != "xno"; then
   PKG_CONFIG(CPPFLAGS,$CPPFLAGS,--cflags,gsl)
-  PKG_CONFIG(LDFLAGS,$LDFLAGS,--libs,gsl)
+  # PKG_CONFIG(LDFLAGS,$LDFLAGS,--libs,gsl)
+  LDFLAGS="$LDFLAGS -lgsl -lflexiblas"
   AC_CHECK_HEADER(gsl/gsl_sf.h,
   CHECK_LIB_STATIC(gsl,gsl,gsl_sf_debye_6,HAVE_LIBGSL,
            AC_MSG_NOTICE([*** Could not find libgsl: will compile without optional special functions. ***])),