diff --git a/lldb/cmake/modules/LLDBConfig.cmake b/lldb/cmake/modules/LLDBConfig.cmake
index ee4c2630d32e2..9bb37f5967d4f 100644
--- a/lldb/cmake/modules/LLDBConfig.cmake
+++ b/lldb/cmake/modules/LLDBConfig.cmake
@@ -292,7 +292,7 @@ endif()
 
 # Figure out if lldb could use lldb-server.  If so, then we'll
 # ensure we build lldb-server when an lldb target is being built.
-if (CMAKE_SYSTEM_NAME MATCHES "Android|Darwin|FreeBSD|Linux|NetBSD|Windows")
+if (CMAKE_SYSTEM_NAME MATCHES "Android|Darwin|FreeBSD|Linux|NetBSD|OpenBSD|Windows")
   set(LLDB_CAN_USE_LLDB_SERVER ON)
 else()
   set(LLDB_CAN_USE_LLDB_SERVER OFF)
diff --git a/lldb/source/Initialization/CMakeLists.txt b/lldb/source/Initialization/CMakeLists.txt
index c1a167826f76f..b6282e162aa10 100644
--- a/lldb/source/Initialization/CMakeLists.txt
+++ b/lldb/source/Initialization/CMakeLists.txt
@@ -1,4 +1,4 @@
-if ( CMAKE_SYSTEM_NAME MATCHES "Linux|Android|FreeBSD|NetBSD" )
+if ( CMAKE_SYSTEM_NAME MATCHES "Linux|Android|FreeBSD|NetBSD|OpenBSD" )
   list(APPEND EXTRA_PLUGINS lldbPluginProcessPOSIX)
 endif()
 
diff --git a/lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp b/lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
index ad13a4406cfda..54028b1b3261a 100644
--- a/lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
+++ b/lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
@@ -95,6 +95,7 @@ ABISysV_x86_64::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch)
     case llvm::Triple::OSType::Linux:
     case llvm::Triple::OSType::MacOSX:
     case llvm::Triple::OSType::NetBSD:
+    case llvm::Triple::OSType::OpenBSD:
     case llvm::Triple::OSType::Solaris:
     case llvm::Triple::OSType::UnknownOS:
       return ABISP(
diff --git a/lldb/source/Plugins/Process/CMakeLists.txt b/lldb/source/Plugins/Process/CMakeLists.txt
index a51d0f7afd175..7f4f6fee7a9ea 100644
--- a/lldb/source/Plugins/Process/CMakeLists.txt
+++ b/lldb/source/Plugins/Process/CMakeLists.txt
@@ -7,6 +7,8 @@ elseif (CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
 elseif (CMAKE_SYSTEM_NAME MATCHES "NetBSD")
   add_subdirectory(NetBSD)
   add_subdirectory(POSIX)
+elseif (CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
+  add_subdirectory(POSIX)
 elseif (CMAKE_SYSTEM_NAME MATCHES "Windows")
   add_subdirectory(Windows/Common)
 elseif (CMAKE_SYSTEM_NAME MATCHES "Darwin")