diff --git a/devel/qt5-buildtools/Makefile b/devel/qt5-buildtools/Makefile
index e9264a322ef4..eb3b7049076b 100644
--- a/devel/qt5-buildtools/Makefile
+++ b/devel/qt5-buildtools/Makefile
@@ -1,44 +1,45 @@
 PORTNAME=	buildtools
 PORTVERSION=	${QT5_VERSION}${QT5_KDE_PATCH}
+PORTREVISION=	1
 CATEGORIES=	devel
 PKGNAMEPREFIX=	qt5-
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	Qt build tools
 
 USES=		compiler:c++11-lang libtool perl5 qmake:no_env qt-dist:5,base
 USE_PERL5=	extract
 HAS_CONFIGURE=	yes
 CONFIGURE_ARGS=	-no-gui -no-xcb
 QT_BINARIES=	yes
 
 BUILD_WRKSRC=	${WRKSRC}/src/tools/bootstrap
 INSTALL_WRKSRC=	${BUILD_WRKSRC}
 
 MORE_WRKSRCS=	src/tools/moc \
 		src/tools/rcc
 
 post-configure:
 .for d in src/tools/bootstrap ${MORE_WRKSRCS}
 	${MKDIR} ${WRKSRC}/${d}
 	cd ${WRKSRC}/${d} && ${SETENV} ${QMAKE_ENV} ${_QMAKE} ${QMAKE_ARGS} ${WRKSRC}/${d}
 .endfor
 
 post-build:
 .for d in ${MORE_WRKSRCS}
 	@cd ${WRKSRC}/${d} && \
 		${SETENV} ${MAKE_ENV} ${MAKE} ${MAKE_FLAGS} ${MAKEFILE} \
 		${_MAKE_JOBS} ${MAKE_ARGS} ${ALL_TARGET}
 .endfor
 
 post-install:
 .for d in ${MORE_WRKSRCS}
 	@cd ${WRKSRC}/${d} && \
 		${SETENV} ${MAKE_ENV} ${MAKE} ${MAKE_FLAGS} ${MAKEFILE} \
 		${MAKE_ARGS} ${INSTALL_TARGET}
 .endfor
 	${INSTALL_SCRIPT} ${WRKSRC}/bin/syncqt.pl \
 		${STAGEDIR}${PREFIX}/${QT_BINDIR_REL}/syncqt.pl
 	${RLN} ${STAGEDIR}${QT_BINDIR}/moc ${STAGEDIR}${PREFIX}/bin/moc-qt5
 	${RLN} ${STAGEDIR}${QT_BINDIR}/rcc ${STAGEDIR}${PREFIX}/bin/rcc-qt5
 .include <bsd.port.mk>
diff --git a/devel/qt5-buildtools/files/patch-src_tools_moc_preprocessor.cpp b/devel/qt5-buildtools/files/patch-src_tools_moc_preprocessor.cpp
new file mode 100644
index 000000000000..32d76d0333ae
--- /dev/null
+++ b/devel/qt5-buildtools/files/patch-src_tools_moc_preprocessor.cpp
@@ -0,0 +1,40 @@
+Backport of [1] to handle the 'L' integer suffix.
+
+[1] https://code.qt.io/cgit/qt/qtbase.git/commit/?id=f0039bd5170ad84d972a023316e8d153b89f841a
+
+--- src/tools/moc/preprocessor.cpp.orig	2025-11-01 21:43:44 UTC
++++ src/tools/moc/preprocessor.cpp
+@@ -247,7 +247,8 @@ Symbols Preprocessor::tokenize(const QByteArray& input
+                             ++data;
+                             while (is_hex_char(*data) || *data == '\'')
+                                 ++data;
+-                        }
++                        } else if (*data == 'L')
++                            ++data;
+                         break;
+                     }
+                     token = FLOATING_LITERAL;
+@@ -424,7 +425,8 @@ Symbols Preprocessor::tokenize(const QByteArray& input
+                         ++data;
+                         while (is_hex_char(*data) || *data == '\'')
+                             ++data;
+-                    }
++                    } else if (*data == 'L')
++                        ++data;
+                     break;
+                 }
+                 token = PP_FLOATING_LITERAL;
+@@ -951,7 +953,12 @@ int PP_Expression::primary_expression()
+         test(PP_RPAREN);
+     } else {
+         next();
+-        value = lexem().toInt(nullptr, 0);
++        const QByteArray &lex = lexem();
++        if (lex.endsWith('L')) {
++            value = lex.left(lex.size() - 1).toInt(nullptr, 0);
++        } else {
++            value = lex.toInt(nullptr, 0);
++        }
+     }
+     return value;
+ }