Add getexecpath(3) support. OK?
diff --git
a/x11/qt6/qtbase/patches/patch-src_corelib_kernel_qcoreapplication_cpp
b/x11/qt6/qtbase/patches/patch-src_corelib_kernel_qcoreapplication_cpp
new file mode 100644
index 00000000000..227afb89e9e
--- /dev/null
+++ b/x11/qt6/qtbase/patches/patch-src_corelib_kernel_qcoreapplication_cpp
@@ -0,0 +1,18 @@
+Index: src/corelib/kernel/qcoreapplication.cpp
+--- src/corelib/kernel/qcoreapplication.cpp.orig
++++ src/corelib/kernel/qcoreapplication.cpp
+@@ -2435,6 +2435,14 @@ static QString qAppFileName()
+ # elif defined(Q_OS_LINUX)
+ // this includes the Embedded Android builds
+ return QFile::decodeName(qt_readlink("/proc/self/exe"));
++# elif defined(__OpenBSD__)
++ char buffer[PATH_MAX];
++ qsizetype len = 0;
++ if (getexecpath(buffer, sizeof buffer) == 0) {
++ len = strlen(buffer);
++ return QFile::decodeName(QByteArray::fromRawData(buffer, len));
++ }
++ return QString();
+ # elif defined(AT_EXECPATH)
+ // seen on FreeBSD, but I suppose the other BSDs could adopt this API
+ char execfn[PATH_MAX];
