depends: Build `qt` and `qrencode` packages for OpenBSD hosts

diff --git a/depends/README.md b/depends/README.md
index b12df135..bdb92794 100644
--- a/depends/README.md
+++ b/depends/README.md
@@ -53,6 +53,10 @@ To build dependencies for the current arch+OS:
 
     pkg_add bash cmake curl gmake gtar
 
+Skip the following packages if you don't intend to use the GUI and will build with [`NO_QT=1`](#dependency-options):
+
+    pkg_add bison ninja
+
 To build dependencies for the current arch+OS:
 
     gmake
diff --git a/depends/packages/freetype.mk b/depends/packages/freetype.mk
index b34edc60..74d5e42a 100644
--- a/depends/packages/freetype.mk
+++ b/depends/packages/freetype.mk
@@ -5,6 +5,7 @@ $(package)_file_name=$(package)-$($(package)_version).tar.gz
 $(package)_sha256_hash=f8db94d307e9c54961b39a1cc799a67d46681480696ed72ecf78d4473770f09b
 $(package)_build_subdir=build
 $(package)_patches += cmake_minimum.patch
+$(package)_patches += openbsd_versioning.patch
 
 define $(package)_set_vars
   $(package)_config_opts := -DCMAKE_BUILD_TYPE=None -DBUILD_SHARED_LIBS=TRUE
@@ -14,7 +15,8 @@ define $(package)_set_vars
 endef
 
 define $(package)_preprocess_cmds
-  patch -p1 < $($(package)_patch_dir)/cmake_minimum.patch
+  patch -p1 < $($(package)_patch_dir)/cmake_minimum.patch && \
+  patch -p1 < $($(package)_patch_dir)/openbsd_versioning.patch
 endef
 
 define $(package)_config_cmds
diff --git a/depends/packages/packages.mk b/depends/packages/packages.mk
index 22ae4787..b77c3eca 100644
--- a/depends/packages/packages.mk
+++ b/depends/packages/packages.mk
@@ -6,11 +6,13 @@ libevent_packages = libevent
 
 qrencode_linux_packages = qrencode
 qrencode_freebsd_packages = qrencode
+qrencode_openbsd_packages = qrencode
 qrencode_darwin_packages = qrencode
 qrencode_mingw32_packages = qrencode
 
 qt_linux_packages:=qt expat libxcb xcb_proto libXau xproto freetype fontconfig libxkbcommon libxcb_util libxcb_util_cursor libxcb_util_render libxcb_util_keysyms libxcb_util_image libxcb_util_wm
 qt_freebsd_packages:=$(qt_linux_packages)
+qt_openbsd_packages:=$(qt_linux_packages)
 qt_darwin_packages=qt
 qt_mingw32_packages=qt
 ifneq ($(host),$(build))
diff --git a/depends/packages/qt.mk b/depends/packages/qt.mk
index 9b7cec34..500a2729 100644
--- a/depends/packages/qt.mk
+++ b/depends/packages/qt.mk
@@ -9,6 +9,7 @@ $(package)_dependencies := native_$(package)
 endif
 $(package)_linux_dependencies := freetype fontconfig libxcb libxkbcommon libxcb_util libxcb_util_cursor libxcb_util_render libxcb_util_keysyms libxcb_util_image libxcb_util_wm
 $(package)_freebsd_dependencies := $($(package)_linux_dependencies)
+$(package)_openbsd_dependencies := $($(package)_linux_dependencies)
 $(package)_patches_path := $(qt_details_patches_path)
 $(package)_patches := cocoa_compat.patch
 $(package)_patches += dont_hardcode_pwd.patch
@@ -26,6 +27,8 @@ $(package)_patches += fix-gcc16-sfinae-qbitarray.patch
 $(package)_patches += fix-gcc16-sfinae-qanystringview.patch
 $(package)_patches += fix-macos26-qyield.patch
 $(package)_patches += fix-qbytearray-include.patch
+$(package)_patches += fix_openbsd_network_kernel.patch
+$(package)_patches += fix_openbsd_plugin_qelfparser.patch
 
 $(package)_qttranslations_file_name=$(qt_details_qttranslations_file_name)
 $(package)_qttranslations_sha256_hash=$(qt_details_qttranslations_sha256_hash)
@@ -158,6 +161,7 @@ $(package)_config_opts_linux += -ltcg
 endif
 $(package)_config_opts_freebsd := $$($(package)_config_opts_linux)
 $(package)_config_opts_freebsd += -no-feature-inotify
+$(package)_config_opts_openbsd := $$($(package)_config_opts_linux)
 
 $(package)_config_opts_mingw32 := -no-dbus
 $(package)_config_opts_mingw32 += -no-feature-freetype
@@ -208,7 +212,7 @@ $(package)_cmake_opts += -DCMAKE_DISABLE_FIND_PACKAGE_WrapSystemDoubleConversion
 $(package)_cmake_opts += -DCMAKE_DISABLE_FIND_PACKAGE_WrapSystemMd4c=TRUE
 $(package)_cmake_opts += -DCMAKE_DISABLE_FIND_PACKAGE_WrapZSTD=TRUE
 endif
-ifeq ($(host_os),linux)
+ifneq (,$(filter linux openbsd,$(host_os)))
 # The `-dbus-runtime` configure option does not work
 # https://qt-project.atlassian.net/browse/QTBUG-144864
 $(package)_cmake_opts += -DINPUT_dbus=runtime
@@ -284,7 +288,9 @@ define $(package)_preprocess_cmds
   patch -p1 -i $($(package)_patch_dir)/fix-gcc16-sfinae-qbitarray.patch && \
   patch -p1 -i $($(package)_patch_dir)/fix-gcc16-sfinae-qanystringview.patch && \
   patch -p1 -i $($(package)_patch_dir)/fix-macos26-qyield.patch && \
-  patch -p1 -i $($(package)_patch_dir)/fix-qbytearray-include.patch
+  patch -p1 -i $($(package)_patch_dir)/fix-qbytearray-include.patch && \
+  patch -p1 -i $($(package)_patch_dir)/fix_openbsd_network_kernel.patch && \
+  patch -p1 -i $($(package)_patch_dir)/fix_openbsd_plugin_qelfparser.patch
 endef
 ifeq ($(host),$(build))
   $(package)_preprocess_cmds += && patch -p1 -i $($(package)_patch_dir)/qttools_skip_dependencies.patch
diff --git a/depends/patches/freetype/openbsd_versioning.patch b/depends/patches/freetype/openbsd_versioning.patch
new file mode 100644
index 00000000..ea5cffef
--- /dev/null
+++ b/depends/patches/freetype/openbsd_versioning.patch
@@ -0,0 +1,31 @@
+[cmake] Fix shared library versioning on OpenBSD.
+
+This emulates Libtool to make sure Libtool and CMake agree on the ABI
+version. Specifically, for OpenBSD, `builds/unix/configure` defines
+`version_type=sunos` and skips defining `soname_spec`.
+
+See upstream MR: https://gitlab.freedesktop.org/freetype/freetype/-/merge_requests/433.
+
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -458,9 +458,17 @@ if (WIN32)
+ endif ()
+ 
+ if (BUILD_SHARED_LIBS)
+-  set_target_properties(freetype PROPERTIES
+-    VERSION ${LIBRARY_VERSION}
+-    SOVERSION ${LIBRARY_SOVERSION})
++  if (CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
++    # For OpenBSD, libtool follows `sunos` version type.
++    set_target_properties(freetype PROPERTIES
++      # libtool does not define its internal `soname_spec` variable
++      # for OpenBSD. So skipping the SOVERSION option.
++      VERSION ${LIBTOOL_CURRENT}.${LIBTOOL_REVISION})
++  else ()
++    set_target_properties(freetype PROPERTIES
++      VERSION ${LIBRARY_VERSION}
++      SOVERSION ${LIBRARY_SOVERSION})
++  endif ()
+ endif ()
+ 
+ # Pick up ftconfig.h and ftoption.h generated above, first.
diff --git a/depends/patches/qt/fix_openbsd_network_kernel.patch b/depends/patches/qt/fix_openbsd_network_kernel.patch
new file mode 100644
index 00000000..2a5a4ac2
--- /dev/null
+++ b/depends/patches/qt/fix_openbsd_network_kernel.patch
@@ -0,0 +1,31 @@
+Fix compiling on OpenBSD
+
+1. The `net/if_types.h` header does not define the `IFT_STF` symbol.
+2. The `netinet6/in6_var.h` header defines some of the used symbols.
+
+For the reference, see:
+ - https://codeberg.org/OpenBSD/ports/src/commit/f8f1aedbe8aff550c69930b5d92b9c392e298382/x11/qt6/qtbase/patches/patch-src_network_kernel_qnetworkinterface_unix_cpp
+
+
+--- a/qtbase/src/network/kernel/qnetworkinterface_unix.cpp
++++ b/qtbase/src/network/kernel/qnetworkinterface_unix.cpp
+@@ -392,6 +392,9 @@ QT_BEGIN_INCLUDE_NAMESPACE
+ #  include <net/if_media.h>
+ #  include <net/if_types.h>
+ #  include <netinet/in_var.h>
++#  ifdef Q_OS_OPENBSD
++#    include <netinet6/in6_var.h>
++#  endif
+ #endif // QT_PLATFORM_UIKIT
+ QT_END_INCLUDE_NAMESPACE
+ 
+@@ -419,7 +422,9 @@ static QNetworkInterface::InterfaceType probeIfType(int socket, int iftype, stru
+         return QNetworkInterface::Ieee1394;
+ 
+     case IFT_GIF:
++#ifndef Q_OS_OPENBSD
+     case IFT_STF:
++#endif
+         return QNetworkInterface::Virtual;
+     }
+ 
diff --git a/depends/patches/qt/fix_openbsd_plugin_qelfparser.patch b/depends/patches/qt/fix_openbsd_plugin_qelfparser.patch
new file mode 100644
index 00000000..1b32e45f
--- /dev/null
+++ b/depends/patches/qt/fix_openbsd_plugin_qelfparser.patch
@@ -0,0 +1,20 @@
+Fix compiling on OpenBSD
+
+Avoid use of undeclared identifier `ELFOSABI_AIX`.
+
+For the reference, see:
+ - https://codeberg.org/OpenBSD/ports/src/commit/c5e4088b89277b96d840492f9961b1593182b99c/x11/qt6/qtbase/patches/patch-src_corelib_plugin_qelfparser_p_cpp
+
+
+--- a/qtbase/src/corelib/plugin/qelfparser_p.cpp
++++ b/qtbase/src/corelib/plugin/qelfparser_p.cpp
+@@ -341,7 +341,9 @@ Q_DECL_UNUSED Q_DECL_COLD_FUNCTION static QDebug &operator<<(QDebug &d, ElfHeade
+     case ELFOSABI_NETBSD:   d << " (NetBSD"; break;
+     case ELFOSABI_LINUX:    d << " (GNU/Linux"; break;
+     case ELFOSABI_SOLARIS:  d << " (Solaris"; break;
++#ifndef Q_OS_OPENBSD
+     case ELFOSABI_AIX:      d << " (AIX"; break;
++#endif
+     case ELFOSABI_IRIX:     d << " (IRIX"; break;
+     case ELFOSABI_FREEBSD:  d << " (FreeBSD"; break;
+     case ELFOSABI_OPENBSD:  d << " (OpenBSD"; break;
diff --git a/depends/toolchain.cmake.in b/depends/toolchain.cmake.in
index 87189efa..9d9f9e49 100644
--- a/depends/toolchain.cmake.in
+++ b/depends/toolchain.cmake.in
@@ -117,7 +117,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND NOT CMAKE_HOST_APPLE)
 endif()
 
 
-if(CMAKE_SYSTEM_NAME MATCHES "^(Linux|FreeBSD)$")
+if(CMAKE_SYSTEM_NAME MATCHES "^(Linux|FreeBSD|OpenBSD)$")
   # Customize pkg-config behavior for finding dependencies
   # of the xcb QPA platform plugin:
   # 1. Restrict search paths to the depends.
diff --git a/src/qt/CMakeLists.txt b/src/qt/CMakeLists.txt
index 58fa08b5..b5ad93dc 100644
--- a/src/qt/CMakeLists.txt
+++ b/src/qt/CMakeLists.txt
@@ -16,7 +16,7 @@ get_target_property(qt_lib_type Qt6::Core TYPE)
 function(import_plugins target)
   if(qt_lib_type STREQUAL "STATIC_LIBRARY")
     set(plugins Qt6::QMinimalIntegrationPlugin)
-    if(CMAKE_SYSTEM_NAME MATCHES "^(Linux|FreeBSD)$")
+    if(CMAKE_SYSTEM_NAME MATCHES "^(Linux|FreeBSD|OpenBSD)$")
       list(APPEND plugins Qt6::QXcbIntegrationPlugin)
     elseif(WIN32)
       list(APPEND plugins Qt6::QWindowsIntegrationPlugin Qt6::QModernWindowsStylePlugin)