diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index 1d9f1d6..fd22455 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -14,3 +14,16 @@
 add_subdirectory(network)
 add_subdirectory(Xregion)
 add_subdirectory(rfb)
+
+# For any convenience libraries that are linked into libvnc.so, we need to
+# explicitly build their corresponding sources using PIC.  WIN32 is excluded
+# because PIC code does not exist on that platform and MinGW complains if -fPIC
+# is passed (additionally, libvnc is not used on Windows.)
+
+if(CMAKE_COMPILER_IS_GNUCXX AND (CMAKE_SIZEOF_VOID_P MATCHES 8) AND NOT WIN32)
+  set_target_properties(os rdr network Xregion rfb
+    PROPERTIES COMPILE_FLAGS -fPIC)
+  if(USE_INCLUDED_ZLIB)
+    set_target_properties(zlib PROPERTIES COMPILE_FLAGS -fPIC)
+  endif()
+endif()
diff --git a/common/Xregion/CMakeLists.txt b/common/Xregion/CMakeLists.txt
index a7788eb..40ca97e 100644
--- a/common/Xregion/CMakeLists.txt
+++ b/common/Xregion/CMakeLists.txt
@@ -1,14 +1,6 @@
 add_library(Xregion STATIC
   Region.c)
 
-# This code goes into libvnc.so, so it needs to be PIC on x86_64.
-# (It should be on archs as well, but we prefer performance over memory
-# efficiency. Win64 is excluded because PIC is always on there and it
-# complains when you give it the explicit flag.)
-if(CMAKE_COMPILER_IS_GNUCXX AND (CMAKE_SIZEOF_VOID_P MATCHES 8) AND NOT WIN32)
-  set_target_properties(Xregion PROPERTIES COMPILE_FLAGS -fPIC)
-endif()
-
 if(UNIX)
   libtool_create_control_file(Xregion)
 endif()
diff --git a/common/network/CMakeLists.txt b/common/network/CMakeLists.txt
index 681d291..ddde574 100644
--- a/common/network/CMakeLists.txt
+++ b/common/network/CMakeLists.txt
@@ -3,14 +3,6 @@
 add_library(network STATIC
   TcpSocket.cxx)
 
-# This code goes into libvnc.so, so it needs to be PIC on x86_64.
-# (It should be on archs as well, but we prefer performance over memory
-# efficiency. Win64 is excluded because PIC is always on there and it
-# complains when you give it the explicit flag.)
-if(CMAKE_COMPILER_IS_GNUCXX AND (CMAKE_SIZEOF_VOID_P MATCHES 8) AND NOT WIN32)
-  set_target_properties(network PROPERTIES COMPILE_FLAGS -fPIC)
-endif()
-
 if(UNIX)
   libtool_create_control_file(network)
 endif()
diff --git a/common/os/CMakeLists.txt b/common/os/CMakeLists.txt
index 623a32f..82f1165 100644
--- a/common/os/CMakeLists.txt
+++ b/common/os/CMakeLists.txt
@@ -5,11 +5,3 @@
   net.c
   os.cxx
   tls.cxx)
-
-# This code goes into libvnc.so, so it needs to be PIC on x86_64.
-# (It should be on archs as well, but we prefer performance over memory
-# efficiency. Win64 is excluded because PIC is always on there and it
-# complains when you give it the explicit flag.)
-if(CMAKE_COMPILER_IS_GNUCXX AND (CMAKE_SIZEOF_VOID_P MATCHES 8) AND NOT WIN32)
-  set_target_properties(os PROPERTIES COMPILE_FLAGS -fPIC)
-endif()
diff --git a/common/rdr/CMakeLists.txt b/common/rdr/CMakeLists.txt
index 6d3ec1d..ee71a9b 100644
--- a/common/rdr/CMakeLists.txt
+++ b/common/rdr/CMakeLists.txt
@@ -24,14 +24,6 @@
 
 target_link_libraries(rdr ${RDR_LIBRARIES})
 
-# This code goes into libvnc.so, so it needs to be PIC on x86_64.
-# (It should be on archs as well, but we prefer performance over memory
-# efficiency. Win64 is excluded because PIC is always on there and it
-# complains when you give it the explicit flag.)
-if(CMAKE_COMPILER_IS_GNUCXX AND (CMAKE_SIZEOF_VOID_P MATCHES 8) AND NOT WIN32)
-  set_target_properties(rdr PROPERTIES COMPILE_FLAGS -fPIC)
-endif()
-
 if(UNIX)
   libtool_create_control_file(rdr)
 endif()
diff --git a/common/rfb/CMakeLists.txt b/common/rfb/CMakeLists.txt
index f8c1a43..be03c64 100644
--- a/common/rfb/CMakeLists.txt
+++ b/common/rfb/CMakeLists.txt
@@ -95,14 +95,6 @@
 
 target_link_libraries(rfb ${RFB_LIBRARIES})
 
-# This code goes into libvnc.so, so it needs to be PIC on x86_64.
-# (It should be on archs as well, but we prefer performance over memory
-# efficiency. Win64 is excluded because PIC is always on there and it
-# complains when you give it the explicit flag.)
-if(CMAKE_COMPILER_IS_GNUCXX AND (CMAKE_SIZEOF_VOID_P MATCHES 8) AND NOT WIN32)
-  set_target_properties(rfb PROPERTIES COMPILE_FLAGS -fPIC)
-endif()
-
 if(UNIX)
   libtool_create_control_file(rfb)
 endif()
diff --git a/common/zlib/CMakeLists.txt b/common/zlib/CMakeLists.txt
index ecee0eb..69f1c9f 100644
--- a/common/zlib/CMakeLists.txt
+++ b/common/zlib/CMakeLists.txt
@@ -20,11 +20,3 @@
   trees.c
   uncompr.c
   zutil.c)
-
-# This code goes into libvnc.so, so it needs to be PIC on x86_64.
-# (It should be on other archs as well, but we prefer performance over memory
-# efficiency. Win64 is excluded because PIC is always on there and it
-# complains when you give it the explicit flag.)
-if(CMAKE_COMPILER_IS_GNUCXX AND (CMAKE_SIZEOF_VOID_P MATCHES 8) AND NOT WIN32)
-  set_target_properties(zlib PROPERTIES COMPILE_FLAGS -fPIC)
-endif()