diff --git a/setter/src/amiga/CMakeLists.txt b/setter/src/amiga/CMakeLists.txt
index d013663..95e98e1 100644
--- a/setter/src/amiga/CMakeLists.txt
+++ b/setter/src/amiga/CMakeLists.txt
@@ -22,7 +22,8 @@
 # Copyright (C) 2011-2021 Natalia Portillo
 # *****************************************************************************/
 
-if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "AmigaOS" AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "MorphOS" AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "AROS")
+if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "AmigaOS|MorphOS" AND NOT AROS)
+    message("Ignoring Amiga")
     return()
 endif()
 
diff --git a/setter/src/beos/CMakeLists.txt b/setter/src/beos/CMakeLists.txt
index 6cd04cf..ff0d9e9 100644
--- a/setter/src/beos/CMakeLists.txt
+++ b/setter/src/beos/CMakeLists.txt
@@ -22,7 +22,7 @@
 # Copyright (C) 2011-2021 Natalia Portillo
 # *****************************************************************************/
 
-if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "BeOS" AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "Haiku")
+if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "BeOS|Haiku")
     return()
 endif()
 
diff --git a/setter/src/macos/CMakeLists.txt b/setter/src/macos/CMakeLists.txt
index 5fa0ae2..e5f94db 100644
--- a/setter/src/macos/CMakeLists.txt
+++ b/setter/src/macos/CMakeLists.txt
@@ -22,7 +22,7 @@
 # Copyright (C) 2011-2021 Natalia Portillo
 # *****************************************************************************/
 
-if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Retro68" AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "RetroPPC")
+if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Retro68|RetroPPC")
     return()
 endif()
 
diff --git a/setter/src/unix/CMakeLists.txt b/setter/src/unix/CMakeLists.txt
index 0b580bd..9205df0 100644
--- a/setter/src/unix/CMakeLists.txt
+++ b/setter/src/unix/CMakeLists.txt
@@ -22,7 +22,7 @@
 # Copyright (C) 2011-2021 Natalia Portillo
 # *****************************************************************************/
 
-if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Linux" AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "^(([^k].*)?BSD|DragonFly)$" )
+if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Linux|Darwin" AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "^(([^k].*)?BSD|DragonFly)$" )
    return()
 endif()