diff --git a/CMakeLists.txt b/CMakeLists.txt
index 57f9e892f..0579aefed 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -46,7 +46,7 @@ endif()
 
 OPTION( BUILD_SHARED_LIBS
   "Build package with shared libraries."
-  OFF
+  ON
 )
 
 OPTION( BUILD_FRAMEWORK
@@ -433,11 +433,11 @@ IF ( ASSIMP_BUILD_ASSIMP_TOOLS )
   # Why here? Maybe user do not want Qt viewer and have no Qt.
   # Why assimp_qt_viewer/CMakeLists.txt still contain similar check?
   # Because viewer can be build independently of Assimp.
-  FIND_PACKAGE(OpenGL QUIET)
   IF (NOT IOS)
   	FIND_PACKAGE(Qt5Widgets QUIET)
   ENDIF (NOT IOS)
   FIND_PACKAGE(DevIL QUIET)
+  FIND_PACKAGE(OpenGL QUIET)
   IF ( Qt5Widgets_FOUND AND IL_FOUND AND OPENGL_FOUND)
     ADD_SUBDIRECTORY( tools/assimp_qt_viewer/ )
   ELSE()
diff --git a/port/iOS/IPHONEOS_ARM64_TOOLCHAIN.cmake b/port/iOS/IPHONEOS_ARM64_TOOLCHAIN.cmake
index 4abcac764..89da24f09 100644
--- a/port/iOS/IPHONEOS_ARM64_TOOLCHAIN.cmake
+++ b/port/iOS/IPHONEOS_ARM64_TOOLCHAIN.cmake
@@ -9,6 +9,12 @@ if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE "Release")
 endif()
 
+SET (CC "${DEVROOT}/usr/bin/clang")
+SET (CXX "${DEVROOT}/usr/bin/clang++")
+
+CMAKE_FORCE_C_COMPILER          (${CC} LLVM)
+CMAKE_FORCE_CXX_COMPILER        (${CXX} LLVM)
+
 set(CMAKE_CXX_FLAGS "-Wall -Wextra")
 set(CMAKE_CXX_FLAGS_DEBUG "-g")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3")
diff --git a/port/iOS/IPHONEOS_ARMV6_TOOLCHAIN.cmake b/port/iOS/IPHONEOS_ARMV6_TOOLCHAIN.cmake
index 5aa7f90f1..686b2faab 100644
--- a/port/iOS/IPHONEOS_ARMV6_TOOLCHAIN.cmake
+++ b/port/iOS/IPHONEOS_ARMV6_TOOLCHAIN.cmake
@@ -9,6 +9,12 @@ if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE "Release")
 endif()
 
+SET (CC "${DEVROOT}/usr/bin/clang")
+SET (CXX "${DEVROOT}/usr/bin/clang++")
+
+CMAKE_FORCE_C_COMPILER          (${CC} LLVM)
+CMAKE_FORCE_CXX_COMPILER        (${CXX} LLVM)
+
 set(CMAKE_CXX_FLAGS "-Wall -Wextra")
 set(CMAKE_CXX_FLAGS_DEBUG "-g")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3")
diff --git a/port/iOS/IPHONEOS_ARMV7S_TOOLCHAIN.cmake b/port/iOS/IPHONEOS_ARMV7S_TOOLCHAIN.cmake
index d35bfce03..f34aad1fe 100644
--- a/port/iOS/IPHONEOS_ARMV7S_TOOLCHAIN.cmake
+++ b/port/iOS/IPHONEOS_ARMV7S_TOOLCHAIN.cmake
@@ -9,6 +9,12 @@ if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE "Release")
 endif()
 
+SET (CC "${DEVROOT}/usr/bin/clang")
+SET (CXX "${DEVROOT}/usr/bin/clang++")
+
+CMAKE_FORCE_C_COMPILER          (${CC} LLVM)
+CMAKE_FORCE_CXX_COMPILER        (${CXX} LLVM)
+
 set(CMAKE_CXX_FLAGS "-Wall -Wextra")
 set(CMAKE_CXX_FLAGS_DEBUG "-g")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3")
diff --git a/port/iOS/IPHONEOS_ARMV7_TOOLCHAIN.cmake b/port/iOS/IPHONEOS_ARMV7_TOOLCHAIN.cmake
index d563bb078..46a0afbea 100644
--- a/port/iOS/IPHONEOS_ARMV7_TOOLCHAIN.cmake
+++ b/port/iOS/IPHONEOS_ARMV7_TOOLCHAIN.cmake
@@ -9,6 +9,12 @@ if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE "Release")
 endif()
 
+SET (CC "${DEVROOT}/usr/bin/clang")
+SET (CXX "${DEVROOT}/usr/bin/clang++")
+
+CMAKE_FORCE_C_COMPILER          (${CC} LLVM)
+CMAKE_FORCE_CXX_COMPILER        (${CXX} LLVM)
+
 set(CMAKE_CXX_FLAGS "-Wall -Wextra")
 set(CMAKE_CXX_FLAGS_DEBUG "-g")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3")
diff --git a/port/iOS/IPHONEOS_I386_TOOLCHAIN.cmake b/port/iOS/IPHONEOS_I386_TOOLCHAIN.cmake
index 6d077567e..919817851 100644
--- a/port/iOS/IPHONEOS_I386_TOOLCHAIN.cmake
+++ b/port/iOS/IPHONEOS_I386_TOOLCHAIN.cmake
@@ -9,6 +9,12 @@ if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE "Release")
 endif()
 
+SET (CC "${DEVROOT}/usr/bin/clang")
+SET (CXX "${DEVROOT}/usr/bin/clang++")
+
+CMAKE_FORCE_C_COMPILER          (${CC} LLVM)
+CMAKE_FORCE_CXX_COMPILER        (${CXX} LLVM)
+
 set(CMAKE_CXX_FLAGS "-Wall -Wextra")
 set(CMAKE_CXX_FLAGS_DEBUG "-g")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3")
diff --git a/port/iOS/IPHONEOS_X86_64_TOOLCHAIN.cmake b/port/iOS/IPHONEOS_X86_64_TOOLCHAIN.cmake
index 354487ce0..a9514ddaa 100644
--- a/port/iOS/IPHONEOS_X86_64_TOOLCHAIN.cmake
+++ b/port/iOS/IPHONEOS_X86_64_TOOLCHAIN.cmake
@@ -9,6 +9,12 @@ if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE "Release")
 endif()
 
+SET (CC "${DEVROOT}/usr/bin/clang")
+SET (CXX "${DEVROOT}/usr/bin/clang++")
+
+CMAKE_FORCE_C_COMPILER          (${CC} LLVM)
+CMAKE_FORCE_CXX_COMPILER        (${CXX} LLVM)
+
 set(CMAKE_CXX_FLAGS "-Wall -Wextra")
 set(CMAKE_CXX_FLAGS_DEBUG "-g")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3")
diff --git a/port/iOS/build.sh b/port/iOS/build.sh
index 7e454fae2..9d4338889 100755
--- a/port/iOS/build.sh
+++ b/port/iOS/build.sh
@@ -24,9 +24,10 @@ IOS_SDK_TARGET=$MIN_IOS_VERSION
 XCODE_ROOT_DIR=$(xcode-select  --print-path)
 TOOLCHAIN=$XCODE_ROOT_DIR/Toolchains/XcodeDefault.xctoolchain
 
-BUILD_ARCHS_DEVICE="armv7 arm64"
-BUILD_ARCHS_SIMULATOR="x86_64 i386"
-BUILD_ARCHS_ALL=(armv7 arm64 x86_64 i386)
+BUILD_ARCHS_DEVICE="arm64"
+BUILD_ARCHS_SIMULATOR="x86_64"
+BUILD_ARCHS_ALL=(arm64 x86_64)
+#BUILD_ARCHS_ALL=(armv7 arm64 x86_64 i386)
 
 CPP_DEV_TARGET_LIST=(miphoneos-version-min mios-simulator-version-min)
 CPP_DEV_TARGET=