dev-libs/qxlsx: Fix build with Qt 6.10, set CMAKE_USE_DIR

Set CMAKE_USE_DIR so upstream patches can apply directly.

Closes: https://bugs.gentoo.org/966279
Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

dev-libs/qxlsx/files/qxlsx-1.5.0-qt6.10.patch

@@ -0,0 +1,28 @@
+From 90d762625750c6b2c73f6cd96b633e9158aed72e Mon Sep 17 00:00:00 2001
+From: Nicolas Fella <nicolas.fella@kdab.com>
+Date: Tue, 10 Jun 2025 11:47:39 +0200
+Subject: [PATCH] Search for GuiPrivate package with Qt 6.10
+
+Qt 6.10 extracts the private modules into a separate CMake package, so search for it
+
+See https://bugreports.qt.io/browse/QTBUG-87776
+---
+ QXlsx/CMakeLists.txt | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/QXlsx/CMakeLists.txt b/QXlsx/CMakeLists.txt
+index 5e16bddc..bbc28e8f 100644
+--- a/QXlsx/CMakeLists.txt
++++ b/QXlsx/CMakeLists.txt
+@@ -17,6 +17,11 @@ if(NOT DEFINED QT_VERSION_MAJOR)
+     find_package(QT NAMES Qt6 Qt5 COMPONENTS Core Gui REQUIRED)
+ endif()
+ find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Gui REQUIRED)
++
++if(Qt6Gui_VERSION VERSION_GREATER_EQUAL "6.10.0")
++    find_package(Qt6 REQUIRED COMPONENTS GuiPrivate)
++endif()
++
+ set(EXPORT_NAME QXlsxQt${QT_VERSION_MAJOR})
+ 
+ if (QT_VERSION_MAJOR EQUAL 6)

dev-libs/qxlsx/qxlsx-1.5.0.ebuild

@@ -8,7 +8,8 @@ inherit cmake
 DESCRIPTION="Excel file(*.xlsx) reader/writer library using Qt"
 HOMEPAGE="https://github.com/QtExcel/QXlsx"
 SRC_URI="https://github.com/QtExcel/QXlsx/archive/v${PV}.tar.gz -> ${P}.tar.gz"
-S="${WORKDIR}/QXlsx-${PV}/QXlsx"
+S="${WORKDIR}/QXlsx-${PV}"
+CMAKE_USE_DIR="${S}/QXlsx"
 
 LICENSE="MIT"
 # soversion
@@ -20,9 +21,11 @@ RDEPEND="
 "
 DEPEND="${RDEPEND}"
 
+PATCHES=( "${FILESDIR}/${P}-qt6.10.patch" ) # bug 966279
+
 src_prepare() {
 	# https://github.com/QtExcel/QXlsx/issues/375#issuecomment-2565987610
-	sed -i -e "s/SOVERSION.*/SOVERSION 0.${PV}/" CMakeLists.txt || die
+	sed -i -e "s/SOVERSION.*/SOVERSION 0.${PV}/" QXlsx/CMakeLists.txt || die
 
 	cmake_src_prepare
 }