diff --git a/gcc_15_fixes.patch b/gcc_15_fixes.patch
new file mode 100644
index 0000000..0d954b0
--- /dev/null
+++ b/gcc_15_fixes.patch
@@ -0,0 +1,20 @@
+Index: xalan/src/xalanc/XMLSupport/XalanOtherEncodingWriter.hpp
+===================================================================
+--- xalan.orig/src/xalanc/XMLSupport/XalanOtherEncodingWriter.hpp	2025-10-22 08:05:45.403631397 -0400
++++ xalan/src/xalanc/XMLSupport/XalanOtherEncodingWriter.hpp	2025-10-22 08:18:14.821542155 -0400
+@@ -320,13 +320,13 @@
+                 {
+                     XalanUnicodeChar    value = decodeUTF16SurrogatePair(ch, theChars[i+1],  getMemoryManager());
+ 
+-                    if (this->m_isPresentable(value))
++                    if (m_predicate(value))
+                     {
+                         write(value);
+                     }
+                     else
+                     {
+-                        this->writeNumberedEntityReference(value);
++                        writeNumericCharacterReference(value);
+                     }
+ 
+                     ++i;
diff --git a/xalan-c.spec b/xalan-c.spec
index 06aff3e..5507f12 100644
--- a/xalan-c.spec
+++ b/xalan-c.spec
@@ -40,6 +40,8 @@ Source3:        Xalan.1
 # from 14 to 17.
 Patch:          https://gitweb.gentoo.org/repo/gentoo.git/plain/dev-libs/xalan-c/files/xalan-c-1.12-icu-75.patch
 
+Patch: gcc_15_fixes.patch
+
 BuildRequires:  gnupg2
 BuildRequires:  cmake
 # Either make or ninja is supported.
@@ -104,7 +106,7 @@ documentation.
 %prep
 %{gpgverify} --keyring='%{SOURCE2}' --signature='%{SOURCE1}' --data='%{SOURCE0}'
 
-%autosetup -n %{tar_name}
+%autosetup -n %{tar_name} -p 1
 
 # https://github.com/apache/xalan-c/pull/35
 chmod -v a-x NOTICE
@@ -123,6 +125,7 @@ find docs samples src -type f -exec file '{}' '+' |
 
 
 %conf
+export CMAKE_POLICY_VERSION_MINIMUM=3.5
 %cmake %{?with_icu:-Dtranscoder=icu} -GNinja