diff --git a/package/perl-html-parser/Config.in b/package/perl-html-parser/Config.in
index afdd5237bb..8a725f1dbd 100644
--- a/package/perl-html-parser/Config.in
+++ b/package/perl-html-parser/Config.in
@@ -1,8 +1,12 @@
 config BR2_PACKAGE_PERL_HTML_PARSER
 	bool "perl-html-parser"
+	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_PERL_HTML_TAGSET
 	help
 	  The HTML-Parser distribution is is a collection of modules that parse
 	  and extract information from HTML documents
 
 	  http://github.com/gisle/html-parser
+
+comment "perl-html-parser needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS
diff --git a/package/perl-libwww-perl/Config.in b/package/perl-libwww-perl/Config.in
index 3db0070a40..fc46bf1dff 100644
--- a/package/perl-libwww-perl/Config.in
+++ b/package/perl-libwww-perl/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_PERL_LIBWWW_PERL
 	bool "perl-libwww-perl"
+	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_PERL_ENCODE_LOCALE
 	select BR2_PACKAGE_PERL_FILE_LISTING
 	select BR2_PACKAGE_PERL_HTML_PARSER
@@ -16,3 +17,6 @@ config BR2_PACKAGE_PERL_LIBWWW_PERL
 	  The World-Wide Web library for Perl
 
 	  https://metacpan.org/release/libwww-perl
+
+comment "perl-libwww-perl needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS
diff --git a/package/perl-mime-base64/Config.in b/package/perl-mime-base64/Config.in
index 7e4858f280..22563dd5ad 100644
--- a/package/perl-mime-base64/Config.in
+++ b/package/perl-mime-base64/Config.in
@@ -1,7 +1,11 @@
 config BR2_PACKAGE_PERL_MIME_BASE64
 	bool "perl-mime-base64"
+	depends on !BR2_STATIC_LIBS
 	help
 	  This package contains a base64 encoder/decoder and a quoted-printable
 	  encoder/decoder.
 
 	  http://github.com/gisle/mime-base64
+
+comment "perl-mime-base64 needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS
diff --git a/package/perl-time-hires/Config.in b/package/perl-time-hires/Config.in
index e10c18a0d2..37bad71d85 100644
--- a/package/perl-time-hires/Config.in
+++ b/package/perl-time-hires/Config.in
@@ -1,6 +1,10 @@
 config BR2_PACKAGE_PERL_TIME_HIRES
 	bool "perl-time-hires"
+	depends on !BR2_STATIC_LIBS
 	help
 	  High resolution alarm, sleep, gettimeofday, interval timers
 
 	  http://search.cpan.org/dist/Time-HiRes/HiRes.pm
+
+comment "perl-time-hires needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS
diff --git a/support/scripts/scancpan b/support/scripts/scancpan
index 1121212594..a33ec8bf46 100755
--- a/support/scripts/scancpan
+++ b/support/scripts/scancpan
@@ -534,7 +534,7 @@ sub is_xs {
     # This heuristic determines if a module is a native extension, by searching
     # some file extension types in the MANIFEST of the distribution.
     # It was inspired by http://deps.cpantesters.org/static/purity.html
-    return $manifest =~ m/\.(swg|xs|c|h|i)\n/;
+    return $manifest =~ m/\.(swg|xs|c|h|i)[\n\s]/;
 }
 
 sub find_license_files {