diff -up ./tools/eqsl/CMakeLists.txt.orig ./tools/eqsl/CMakeLists.txt
--- ./tools/eqsl/CMakeLists.txt.orig	2018-10-17 16:58:01.229578689 +0300
+++ ./tools/eqsl/CMakeLists.txt	2018-10-17 16:59:15.323953397 +0300
@@ -5,6 +5,8 @@ if(NOT Boost_THREAD_FOUND OR NOT Boost_R
 	message(FATAL_ERROR "Eqsl requires boost thread, regex, and Qt4 to build")
 endif()
 
+find_package(Threads REQUIRED)
+
 qt4_wrap_cpp(moc_srcs eqsl.h)
 set(eqsl_srcs
 	eqsl.cpp
@@ -21,7 +23,7 @@ endif()
 include_directories(${QT_INCLUDES})
 
 aqsis_add_executable(eqsl ${eqsl_srcs} GUIAPP
-	LINK_LIBRARIES aqsis_util ${QT_QTGUI_LIBRARY} ${QT_QTCORE_LIBRARY}
+	LINK_LIBRARIES aqsis_util Threads::Threads ${QT_QTGUI_LIBRARY} ${QT_QTCORE_LIBRARY}
 		${eqsl_link_libraries}
 		${Boost_THREAD_LIBRARY} ${Boost_REGEX_LIBRARY})
 
diff -up ./tools/piqsl/CMakeLists.txt.orig ./tools/piqsl/CMakeLists.txt
--- ./tools/piqsl/CMakeLists.txt.orig	2018-10-17 17:07:17.815272220 +0300
+++ ./tools/piqsl/CMakeLists.txt	2018-10-17 17:08:27.603596022 +0300
@@ -5,6 +5,8 @@ if(NOT Boost_THREAD_FOUND OR NOT QT_FOUN
     message(FATAL_ERROR "Piqsl requires boost thread and Qt4 to build")
 endif()
 
+find_package(Threads REQUIRED)
+
 include_subproject(tinyxml)
 
 set(piqsl_hdrs
@@ -36,7 +38,7 @@ set(piqsl_srcs
 include_directories(${QT_INCLUDES})
 
 aqsis_add_executable(piqsl ${piqsl_srcs} ${piqsl_hdrs} GUIAPP
-    LINK_LIBRARIES aqsis_util aqsis_tex ${QT_QTGUI_LIBRARY} ${QT_QTCORE_LIBRARY}
+    LINK_LIBRARIES aqsis_util aqsis_tex Threads::Threads ${QT_QTGUI_LIBRARY} ${QT_QTCORE_LIBRARY}
         ${Boost_THREAD_LIBRARY} ${AQSIS_TINYXML_LIBRARY})
 
 aqsis_install_targets(piqsl)