diff --git a/src/OpenThreads/CMakeLists.txt b/src/OpenThreads/CMakeLists.txt
index f2d48d429..4a730db53 100644
--- a/src/OpenThreads/CMakeLists.txt
+++ b/src/OpenThreads/CMakeLists.txt
@@ -76,17 +76,6 @@ IF(NOT ANDROID)
 # Use our modified version of FindThreads.cmake which has Sproc hacks.
     FIND_PACKAGE(Threads)
 ENDIF()
-# Do we have sproc?
-IF(CMAKE_SYSTEM MATCHES IRIX)
-    IF(CMAKE_USE_SPROC_INIT)
-        # In this case, only Sproc exists, so no option.
-        SET(OPENTHREADS_USE_SPROC_INSTEAD_OF_PTHREADS 1)
-    ELSE()
-        IF(CMAKE_HAVE_SPROC_H)
-            OPTION(OPENTHREADS_USE_SPROC_INSTEAD_OF_PTHREADS "Set to ON to build OpenThreads against sproc instead of pthreads" OFF)
-        ENDIF()
-    ENDIF()
-ENDIF(CMAKE_SYSTEM MATCHES IRIX)
 
 # Add support for using Qt threads
 IF(QT4_FOUND OR Qt5Widgets_FOUND)
@@ -109,11 +98,7 @@ ELSEIF(WIN32)
     ENDIF()
 ELSE()
     IF(UNIX)
-        IF(OPENTHREADS_USE_SPROC_INSTEAD_OF_PTHREADS)
-            SUBDIRS(sproc)
-        ELSE()
-            SUBDIRS(pthreads)
-        ENDIF()
+        SUBDIRS(pthreads)
     ELSE()
         MESSAGE("Sorry, OpenThreads may not support your platform")
     ENDIF()