diff --git a/cpanspec.yml b/cpanspec.yml
index 29233d3..aaa9fa6 100644
--- a/cpanspec.yml
+++ b/cpanspec.yml
@@ -22,8 +22,10 @@ preamble: |-
 # sed on %{name}.files
 license: GPL-1.0-or-later
 #skip_noarch: 1
-#custom_build: |-
-#./Build build flags=%{?_smp_mflags} --myflag
+custom_build: |-
+  # https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2341023
+  perl Makefile.PL INSTALLDIRS=vendor OPTIMIZE="%{optflags} -std=gnu11"
+  %make_build
 #custom_test: |-
 #startserver && make test
 #ignore_requires: Bizarre::Module
diff --git a/perl-Convert-UUlib.changes b/perl-Convert-UUlib.changes
index 3f1ee69..77817d4 100644
--- a/perl-Convert-UUlib.changes
+++ b/perl-Convert-UUlib.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Thu May 29 12:53:01 UTC 2025 - pgajdos@suse.com
+
+- -std=gnu11 to fix build with gcc15
+- modified sources
+  % cpanspec.yml
+
 -------------------------------------------------------------------
 Thu Feb  6 22:19:20 UTC 2025 - Tina Müller <tina.mueller@suse.com>
 
diff --git a/perl-Convert-UUlib.spec b/perl-Convert-UUlib.spec
index 3b92aa5..887cd3f 100644
--- a/perl-Convert-UUlib.spec
+++ b/perl-Convert-UUlib.spec
@@ -63,7 +63,8 @@ this document and especially the non-trivial decoder program at the end.
 find . -type f ! -path "*/t/*" ! -name "*.pl" ! -path "*/bin/*" ! -path "*/script/*" ! -path "*/scripts/*" ! -name "configure" -print0 | xargs -0 chmod 644
 
 %build
-perl Makefile.PL INSTALLDIRS=vendor OPTIMIZE="%{optflags}"
+# https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2341023
+perl Makefile.PL INSTALLDIRS=vendor OPTIMIZE="%{optflags} -std=gnu11"
 %make_build
 
 %check