diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4e4b83b0..44a8188a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,6 +40,15 @@ set(LIBJPEG_TURBO_VERSION_NUMBER ${VERSION_MAJOR}${VERSION_MINOR}${VERSION_REVIS
 # application bundles would break our iOS packages.)
 set(CMAKE_MACOSX_BUNDLE FALSE)
 
+get_property(GENERATOR_IS_MULTI_CONFIG GLOBAL PROPERTY
+  GENERATOR_IS_MULTI_CONFIG)
+# If the GENERATOR_IS_MULTI_CONFIG property doesn't exist (CMake < 3.9), then
+# set the GENERATOR_IS_MULTI_CONFIG variable manually if the generator is
+# Visual Studio or Xcode (the only multi-config generators in CMake < 3.9).
+if(NOT GENERATOR_IS_MULTI_CONFIG AND (MSVC_IDE OR XCODE))
+  set(GENERATOR_IS_MULTI_CONFIG TRUE)
+endif()
+
 string(TIMESTAMP DEFAULT_BUILD "%Y%m%d")
 set(BUILD ${DEFAULT_BUILD} CACHE STRING "Build string (default: ${DEFAULT_BUILD})")
 
@@ -270,6 +279,16 @@ if(NOT WITH_JPEG8)
   report_option(WITH_MEM_SRCDST "In-memory source/destination managers")
 endif()
 
+# 0: Original libjpeg v6b/v7/v8 API/ABI
+#
+# libjpeg v6b/v7 API/ABI emulation:
+# 1: + In-memory source/destination managers (libjpeg-turbo 1.3.x)
+# 2: + Partial image decompression functions (libjpeg-turbo 1.5.x)
+# 3: + ICC functions (libjpeg-turbo 2.0.x)
+#
+# libjpeg v8 API/ABI emulation:
+# 1: + Partial image decompression functions (libjpeg-turbo 1.5.x)
+# 2: + ICC functions (libjpeg-turbo 2.0.x)
 set(SO_AGE 2)
 if(WITH_MEM_SRCDST)
   set(SO_AGE 3)
@@ -320,8 +339,19 @@ message(STATUS "libjpeg API shared library version = ${SO_MAJOR_VERSION}.${SO_AG
 # names of functions whenever they are modified in a backward-incompatible
 # manner, it is always backward-ABI-compatible with itself, so the major and
 # minor SO versions don't change.  However, we increase the middle number (the
-# SO "age") whenever functions are added to the API.
+# SO "age") whenever functions are added to the API, because adding functions
+# affects forward API/ABI compatibility.
 set(TURBOJPEG_SO_MAJOR_VERSION 0)
+# 0: TurboJPEG 1.3.x API
+# 1: TurboJPEG 1.4.x API
+#    The TurboJPEG 1.5.x API modified some of the function prototypes, adding
+#    the const keyword in front of pointers to unmodified buffers, but that did
+#    not affect forward API/ABI compatibility.
+# 2: TurboJPEG 2.0.x API
+#    The TurboJPEG 2.1.x API modified the behavior of the tjDecompressHeader3()
+#    function so that it accepts "abbreviated table specification" (AKA
+#    "tables-only") datastreams as well as JPEG images, but that did not affect
+#    forward API/ABI compatibility.
 set(TURBOJPEG_SO_AGE 2)
 set(TURBOJPEG_SO_VERSION 0.${TURBOJPEG_SO_AGE}.0)
 
@@ -735,7 +765,7 @@ add_executable(strtest strtest.c)
 
 add_subdirectory(md5)
 
-if(MSVC_IDE OR XCODE)
+if(GENERATOR_IS_MULTI_CONFIG)
   set(OBJDIR "\${CTEST_CONFIGURATION_TYPE}/")
 else()
   set(OBJDIR "")
@@ -1562,7 +1592,7 @@ if(WITH_TURBOJPEG)
       INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
       ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
     if(NOT ENABLE_SHARED)
-      if(MSVC_IDE OR XCODE)
+      if(GENERATOR_IS_MULTI_CONFIG)
         set(DIR "${CMAKE_CURRENT_BINARY_DIR}/\${CMAKE_INSTALL_CONFIG_NAME}")
       else()
         set(DIR ${CMAKE_CURRENT_BINARY_DIR})
@@ -1580,7 +1610,7 @@ if(ENABLE_STATIC)
     INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
   if(NOT ENABLE_SHARED)
-    if(MSVC_IDE OR XCODE)
+    if(GENERATOR_IS_MULTI_CONFIG)
       set(DIR "${CMAKE_CURRENT_BINARY_DIR}/\${CMAKE_INSTALL_CONFIG_NAME}")
     else()
       set(DIR ${CMAKE_CURRENT_BINARY_DIR})
diff --git a/ChangeLog.md b/ChangeLog.md
index 5b58b1ad..694e18bc 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -21,10 +21,21 @@ tables.
 have been removed.
 
 
+2.1.5
+=====
+
+### Significant changes relative to 2.1.4:
+
+1. Fixed issues in the build system whereby, when using the Ninja Multi-Config
+CMake generator, a static build of libjpeg-turbo (a build in which
+`ENABLE_SHARED` is `0`) could not be installed, a Windows installer could not
+be built, and the Java regression tests failed.
+
+
 2.1.4
 =====
 
-### Significant changes relative to 2.1.3
+### Significant changes relative to 2.1.3:
 
 1. Fixed a regression introduced in 2.1.3 that caused build failures with
 Visual Studio 2010.
@@ -59,7 +70,7 @@ virtual array access") under certain circumstances.
 2.1.3
 =====
 
-### Significant changes relative to 2.1.2
+### Significant changes relative to 2.1.2:
 
 1. Fixed a regression introduced by 2.0 beta1[7] whereby cjpeg compressed PGM
 input files into full-color JPEG images unless the `-grayscale` option was
@@ -83,7 +94,7 @@ be reproduced using the libjpeg API, not using djpeg.
 2.1.2
 =====
 
-### Significant changes relative to 2.1.1
+### Significant changes relative to 2.1.1:
 
 1. Fixed a regression introduced by 2.1 beta1[13] that caused the remaining
 GAS implementations of AArch64 (Arm 64-bit) Neon SIMD functions (which are used
@@ -115,7 +126,7 @@ image contains incomplete or corrupt image data.
 2.1.1
 =====
 
-### Significant changes relative to 2.1.0
+### Significant changes relative to 2.1.0:
 
 1. Fixed a regression introduced in 2.1.0 that caused build failures with
 non-GCC-compatible compilers for Un*x/Arm platforms.
@@ -144,7 +155,7 @@ transform a specially-crafted malformed JPEG image.
 2.1.0
 =====
 
-### Significant changes relative to 2.1 beta1
+### Significant changes relative to 2.1 beta1:
 
 1. Fixed a regression introduced by 2.1 beta1[6(b)] whereby attempting to
 decompress certain progressive JPEG images with one or more component planes of
diff --git a/cmakescripts/BuildPackages.cmake b/cmakescripts/BuildPackages.cmake
index eb2cf6ac..abf6a90c 100644
--- a/cmakescripts/BuildPackages.cmake
+++ b/cmakescripts/BuildPackages.cmake
@@ -94,7 +94,7 @@ if(WITH_12BIT)
   set(INST_DEFS ${INST_DEFS} -D12BIT)
 endif()
 
-if(MSVC_IDE)
+if(GENERATOR_IS_MULTI_CONFIG)
   set(INST_DEFS ${INST_DEFS} "-DBUILDDIR=${CMAKE_CFG_INTDIR}\\")
 else()
   set(INST_DEFS ${INST_DEFS} "-DBUILDDIR=")