pbulk on Solaris 10

Hi,

I'm trying to setup a pbulk environment on Solaris 10. In NetBSD usually setup this be running /usr/pkgsrc/mk/pbulk/pbulk.sh. I added a few parameter in Solaris 10 since i'm using sunpro compiler instead of gcc and to fix a circular depedency with tnftp/ncurse :

env FETCH_USING=fetch CC=/opt/solstudio/bin/cc CXX=/opt/solstudio/bin/CC CPP="/opt/solstudio/bin/cc -E" CXXCPP="/opt/solstudio/bin/CC -E" SUNWSPROBASE=/opt/solstudio PKGSRC_COMPILER=sunpro ksh /usr/pkgsrc/mk/pbulk/pbulk.sh -nlc /root/mk.conf.frag

[root@zone4 ~]$ cat /root/mk.conf.frag
PKGSRC_COMPILER=sunpro
PKG_DEVELOPER=yes
MAKE_JOBS=2
SKIP_LICENSE_CHECK=yes
ALLOW_VULNERABLE_PACKAGES=YES
USE_CWRAPPERS=no
BATCH=yes
FETCH_USING=fetch
CC=/opt/solarisstudio12.4/bin/cc
CXX=/opt/solarisstudio12.4/bin/CC
CPP="/opt/solarisstudio12.4/bin/cc -E"
CXXCPP="/opt/solarisstudio12.4/bin/CC -E"
SUNWSPROBASE=/opt/solstudio

Still it fails giving me this error :

=> Checking file-check results for perl-5.26.2
=> Checking for non-existent script interpreters in perl-5.26.2
ERROR: [check-interpreter.mk] The interpreter "perl" of "/tmp/obj-pbulk/lang/perl5/work/.destdir/usr/pbulk/lib/perl5/5.26.0/Math/BigFloat/Trace.pm" does not exist.
ERROR: [check-interpreter.mk] The interpreter "perl" of "/tmp/obj-pbulk/lang/perl5/work/.destdir/usr/pbulk/lib/perl5/5.26.0/Math/BigInt/Trace.pm" does not exist.
*** Error code 1
Stop.
bmake[3]: stopped in /usr/pkgsrc/lang/perl5
*** Error code 1
Stop.
bmake[2]: stopped in /usr/pkgsrc/lang/perl5
*** Error code 1
Stop.
bmake[1]: stopped in /usr/pkgsrc/net/rsync
*** Error code 1
Stop.
bmake: stopped in /usr/pkgsrc/pkgtools/pbulk

It seems to complain about an interpreter :

[root@zone4 ~]$ head /tmp/obj-pbulk/lang/perl5/work/.destdir/usr/pbulk/lib/perl5/5.26.0/Math/BigFloat/Trace.pm
#!perl

Perl is installed on my host :

[root@zone4 ~]$ which perl
/usr/bin/perl

My guess would be that a variable that should containt the path to perl is empty. Does it ring a bell to someone ?