--- perldl.conf.orig	2022-05-06 12:34:58.000000000 -0700
+++ perldl.conf	2022-05-06 12:44:24.000000000 -0700
@@ -45,7 +45,7 @@
 # optimization, and -g to produce debugging information that GDB and
 # other debuggers can use.
 
-        OPTIMIZE => undef, # '-O0 -g',
+        OPTIMIZE => '-O0 -g -v', # '-O0 -g',
 
 # Use posix threading to make use of multiprocessor machines
 # undef -> try if possible
@@ -97,7 +97,7 @@
 # false -> don't use
 # true -> force use
 
-        WITH_HDF => undef,     # Leave it up to PDL to decide
+        WITH_HDF => __WITH_HDF__,     # Leave it up to PDL to decide
         HDF_LIBS => undef,
         HDF_INC => undef,
 
@@ -105,7 +105,7 @@
 # false -> don't use
 # true -> force use
 
-        WITH_GD => undef,      # Leave it up to PDL to decide
+        WITH_GD => __WITH_GD__, # Leave it up to PDL to decide
         GD_LIBS => undef,
         GD_INC => undef,
         GD_DEFINE => '',       # If anything needs to be defined.