diff --git a/cmake/external/abseil.CMakeLists.txt b/cmake/external/abseil.CMakeLists.txt
index 9426f69f29..a23eade833 100644
--- a/cmake/external/abseil.CMakeLists.txt
+++ b/cmake/external/abseil.CMakeLists.txt
@@ -9,11 +9,11 @@ project(abseil-cpp-download NONE)
 include(ExternalProject)
 ExternalProject_Add(abseil-cpp_project
 	GIT_REPOSITORY https://github.com/abseil/abseil-cpp
-	GIT_TAG "7c7754f"
+	GIT_TAG "bf29470"
 	SOURCE_DIR "${CMAKE_BINARY_DIR}/abseil-cpp-src"
 	BINARY_DIR "${CMAKE_BINARY_DIR}/abseil-cpp-build"
 	UPDATE_COMMAND ""
-	PATCH_COMMAND git apply "${PROJECT_SOURCE_DIR}/patches/abseil-cpp-7c7754f.patch"
+	PATCH_COMMAND git apply "${PROJECT_SOURCE_DIR}/patches/abseil-cpp-bf29470.patch"
 	CONFIGURE_COMMAND ""
 	BUILD_COMMAND ""
 	INSTALL_COMMAND ""
diff --git a/makefiles/Makefile.third_party.unix.mk b/makefiles/Makefile.third_party.unix.mk
index 18e1b198bd..3e5093aa01 100644
--- a/makefiles/Makefile.third_party.unix.mk
+++ b/makefiles/Makefile.third_party.unix.mk
@@ -22,7 +22,7 @@ PROTOC_BINARY := $(shell $(WHICH) ${UNIX_PROTOC_BINARY})
 GFLAGS_TAG = 2.2.2
 GLOG_TAG = 0.3.5
 PROTOBUF_TAG = 3.6.1
-ABSL_TAG = 7c7754f
+ABSL_TAG = bf29470
 CBC_TAG = 2.9.9
 CGL_TAG = 0.59.10
 CLP_TAG = 1.16.11
@@ -358,7 +358,6 @@ dependencies/sources/abseil-cpp-$(ABSL_TAG): | dependencies/sources
 	git clone --quiet https://github.com/abseil/abseil-cpp.git dependencies/sources/abseil-cpp-$(ABSL_TAG)
 	cd dependencies/sources/abseil-cpp-$(ABSL_TAG) && git reset --hard $(ABSL_TAG)
 	cd dependencies/sources/abseil-cpp-$(ABSL_TAG) && git apply "$(OR_TOOLS_TOP)/patches/abseil-cpp-$(ABSL_TAG).patch"
-	$(COPY) patches/abslConfig.cmake.in	dependencies/sources/abseil-cpp-$(ABSL_TAG)/CMake
 
 ABSL_INC = -I$(UNIX_ABSL_DIR)/include
 ABSL_SWIG = $(ABSL_INC)
diff --git a/makefiles/Makefile.third_party.win.mk b/makefiles/Makefile.third_party.win.mk
index a9a36b3b9f..82dc61bd59 100644
--- a/makefiles/Makefile.third_party.win.mk
+++ b/makefiles/Makefile.third_party.win.mk
@@ -38,7 +38,7 @@ ZLIB_ARCHIVE_TAG = 1211
 GFLAGS_TAG = 2.2.2
 GLOG_TAG = 0.3.5
 PROTOBUF_TAG = 3.6.1
-ABSL_TAG = 7c7754f
+ABSL_TAG = bf29470
 CBC_TAG = 2.9.9
 CGL_TAG = 0.59.10
 CLP_TAG = 1.16.11
@@ -371,7 +371,6 @@ dependencies/sources/abseil-cpp-$(ABSL_TAG): | dependencies/sources
 	git clone --quiet https://github.com/abseil/abseil-cpp.git dependencies\sources\abseil-cpp-$(ABSL_TAG)
 	cd dependencies\sources\abseil-cpp-$(ABSL_TAG) && git reset --hard $(ABSL_TAG)
 	cd dependencies\sources\abseil-cpp-$(ABSL_TAG) && git apply "$(OR_TOOLS_TOP)\patches\abseil-cpp-$(ABSL_TAG).patch"
-	$(COPY) patches\abslConfig.cmake.in dependencies\sources\abseil-cpp-$(ABSL_TAG)\CMake
 
 ABSL_INC = /I"$(WINDOWS_ABSL_PATH)\\include"
 ABSL_SWIG = -I"$(WINDOWS_ABSL_PATH)/include"
diff --git a/patches/abseil-cpp-7c7754f.patch b/patches/abseil-cpp-7c7754f.patch
deleted file mode 100644
index 88e304d4ac..0000000000
--- a/patches/abseil-cpp-7c7754f.patch
+++ /dev/null
@@ -1,161 +0,0 @@
-diff --git a/CMake/AbseilHelpers.cmake b/CMake/AbseilHelpers.cmake
-index 8fdd510..f5eb10c 100644
---- a/CMake/AbseilHelpers.cmake
-+++ b/CMake/AbseilHelpers.cmake
-@@ -17,6 +17,10 @@
- include(CMakeParseArguments)
- include(AbseilConfigureCopts)
- 
-+if(ABSL_ENABLE_INSTALL)
-+  include(GNUInstallDirs)
-+endif()
-+
- # The IDE folder for Abseil that will be used if Abseil is included in a CMake
- # project that sets
- #    set_property(GLOBAL PROPERTY USE_FOLDERS ON)
-@@ -76,14 +80,18 @@ set(ABSL_IDE_FOLDER Abseil)
- # TODO: Implement "ALWAYSLINK"
- function(absl_cc_library)
-   cmake_parse_arguments(ABSL_CC_LIB
--    "DISABLE_INSTALL;PUBLIC;TESTONLY"
-+    "PUBLIC;TESTONLY"
-     "NAME"
-     "HDRS;SRCS;COPTS;DEFINES;LINKOPTS;DEPS"
-     ${ARGN}
-   )
- 
-   if (NOT ABSL_CC_LIB_TESTONLY OR ABSL_RUN_TESTS)
--    set(_NAME "absl_${ABSL_CC_LIB_NAME}")
-+    if (NOT ABSL_ENABLE_INSTALL)
-+      set(_NAME "absl_${ABSL_CC_LIB_NAME}")
-+    else()
-+      set(_NAME "${ABSL_CC_LIB_NAME}")
-+    endif()
- 
-     # Check if this is a header-only library
-     # Note that as of February 2019, many popular OS's (for example, Ubuntu
-@@ -103,9 +111,14 @@ function(absl_cc_library)
- 
-     if(NOT ABSL_CC_LIB_IS_INTERFACE)
-       add_library(${_NAME} STATIC "")
-+      set_target_properties(${_NAME} PROPERTIES
-+        OUTPUT_NAME "absl_${_NAME}"
-+      )
-       target_sources(${_NAME} PRIVATE ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS})
--      target_include_directories(${_NAME}
--        PUBLIC ${ABSL_COMMON_INCLUDE_DIRS})
-+      target_include_directories(${_NAME} PUBLIC
-+        $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
-+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>  # <prefix>/include
-+      )
-       target_compile_options(${_NAME}
-         PRIVATE ${ABSL_CC_LIB_COPTS})
-       target_link_libraries(${_NAME}
-@@ -129,8 +142,10 @@ function(absl_cc_library)
-     else()
-       # Generating header-only library
-       add_library(${_NAME} INTERFACE)
--      target_include_directories(${_NAME}
--        INTERFACE ${ABSL_COMMON_INCLUDE_DIRS})
-+      target_include_directories(${_NAME} INTERFACE
-+        $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
-+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>  # <prefix>/include
-+      )
-       target_link_libraries(${_NAME}
-         INTERFACE ${ABSL_CC_LIB_DEPS} ${ABSL_CC_LIB_LINKOPTS}
-       )
-@@ -138,6 +153,15 @@ function(absl_cc_library)
-     endif()
- 
-     add_library(absl::${ABSL_CC_LIB_NAME} ALIAS ${_NAME})
-+    # install rules
-+    if(ABSL_ENABLE_INSTALL)
-+      install(TARGETS ${_NAME}
-+        EXPORT ${PROJECT_NAME}Targets
-+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-+        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-+      )
-+    endif()
-   endif()
- endfunction()
- 
-@@ -194,7 +218,7 @@ function(absl_cc_test)
-   add_executable(${_NAME} "")
-   target_sources(${_NAME} PRIVATE ${ABSL_CC_TEST_SRCS})
-   target_include_directories(${_NAME}
--    PUBLIC ${ABSL_COMMON_INCLUDE_DIRS}
-+    PUBLIC $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
-     PRIVATE ${GMOCK_INCLUDE_DIRS} ${GTEST_INCLUDE_DIRS}
-   )
-   target_compile_definitions(${_NAME}
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 571e48c..6c4854a 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -26,7 +26,19 @@ if (POLICY CMP0025)
-   cmake_policy(SET CMP0025 NEW)
- endif()
- 
--project(absl)
-+# Enable MACOSX_RPATH by default.
-+if(POLICY CMP0042)
-+  cmake_policy (SET CMP0042 NEW)
-+endif()
-+
-+project(absl VERSION 1.0.0 LANGUAGES CXX)
-+
-+option(ABSL_ENABLE_INSTALL "If ON, Abseil enable install rules." ON)
-+# when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp))
-+# in the source tree of a project that uses it, install rules are disabled.
-+if(NOT "^${CMAKE_SOURCE_DIR}$" STREQUAL "^${PROJECT_SOURCE_DIR}$")
-+  set(ABSL_ENABLE_INSTALL OFF)
-+endif()
- 
- list(APPEND CMAKE_MODULE_PATH
-   ${CMAKE_CURRENT_LIST_DIR}/CMake
-@@ -93,3 +105,44 @@ if(BUILD_TESTING)
- endif()
- 
- add_subdirectory(absl)
-+
-+# install rules
-+if(ABSL_ENABLE_INSTALL)
-+  # See https://cmake.org/cmake/help/latest/module/GNUInstallDirs.html
-+  include(GNUInstallDirs)
-+  # See https://cmake.org/cmake/help/latest/command/find_package.html#search-procedure
-+  set(CMAKE_INSTALL_CONFIGDIR ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
-+  install(
-+    EXPORT ${PROJECT_NAME}Targets
-+    NAMESPACE absl::
-+    DESTINATION ${CMAKE_INSTALL_CONFIGDIR}
-+  )
-+  install(
-+    DIRECTORY absl
-+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-+    COMPONENT Devel
-+    FILES_MATCHING
-+    PATTERN "*.inc"
-+    PATTERN "*.h"
-+  )
-+
-+  # See https://cmake.org/cmake/help/latest/module/CMakePackageConfigHelpers.html
-+  include(CMakePackageConfigHelpers)
-+  configure_package_config_file(
-+    CMake/abslConfig.cmake.in
-+    "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-+    INSTALL_DESTINATION "${CMAKE_INSTALL_CONFIGDIR}"
-+    NO_CHECK_REQUIRED_COMPONENTS_MACRO
-+  )
-+  write_basic_package_version_file(
-+    "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
-+    COMPATIBILITY ExactVersion
-+  )
-+  install(
-+    FILES
-+    "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-+    "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
-+    DESTINATION "${CMAKE_INSTALL_CONFIGDIR}"
-+    COMPONENT Devel
-+  )
-+endif()
diff --git a/patches/abseil-cpp-bf29470.patch b/patches/abseil-cpp-bf29470.patch
new file mode 100644
index 0000000000..922fdd0665
--- /dev/null
+++ b/patches/abseil-cpp-bf29470.patch
@@ -0,0 +1,90 @@
+diff --git a/CMake/AbseilHelpers.cmake b/CMake/AbseilHelpers.cmake
+index 6d26169..5e839c5 100644
+--- a/CMake/AbseilHelpers.cmake
++++ b/CMake/AbseilHelpers.cmake
+@@ -81,7 +81,11 @@ function(absl_cc_library)
+   )
+ 
+   if (NOT ABSL_CC_LIB_TESTONLY OR ABSL_RUN_TESTS)
+-    set(_NAME "${ABSL_CC_LIB_NAME}")
++    if (NOT ABSL_ENABLE_INSTALL)
++      set(_NAME "absl_${ABSL_CC_LIB_NAME}")
++    else()
++      set(_NAME "${ABSL_CC_LIB_NAME}")
++    endif()
+ 
+     # Check if this is a header-only library
+     # Note that as of February 2019, many popular OS's (for example, Ubuntu
+@@ -150,7 +154,7 @@ function(absl_cc_library)
+ 
+     # TODO currently we don't install googletest alongside abseil sources, so
+     # installed abseil can't be tested.
+-    if (NOT ABSL_CC_LIB_TESTONLY)
++    if (NOT ABSL_CC_LIB_TESTONLY AND ABSL_ENABLE_INSTALL)
+       install(TARGETS ${_NAME} EXPORT ${PROJECT_NAME}Targets
+             RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+             LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e3bb8d0..7786ae7 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -29,6 +29,11 @@ endif()
+ # if command can use IN_LIST
+ cmake_policy(SET CMP0057 NEW)
+ 
++# Enable MACOSX_RPATH by default.
++if(POLICY CMP0042)
++  cmake_policy (SET CMP0042 NEW)
++endif()
++
+ project(absl)
+ 
+ # when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp))
+@@ -118,25 +123,28 @@ endif()
+ 
+ add_subdirectory(absl)
+ 
+-# install as a subdirectory only
+-install(EXPORT ${PROJECT_NAME}Targets
+-  NAMESPACE absl::
+-  DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake"
+-)
++# install rules
++if(ABSL_ENABLE_INSTALL)
++  # install as a subdirectory only
++  install(EXPORT ${PROJECT_NAME}Targets
++    NAMESPACE absl::
++    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake"
++  )
+ 
+-configure_package_config_file(
+-  CMake/abslConfig.cmake.in
+-  "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+-  INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake"
+-)
++  configure_package_config_file(
++    CMake/abslConfig.cmake.in
++    "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
++    INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake"
++  )
+ 
+-install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+-  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake
+-)
++  install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
++    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake
++  )
+ 
+-install(DIRECTORY absl
+-  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+-  FILES_MATCHING
+-    PATTERN "*.inc"
+-    PATTERN "*.h"
+-)
++  install(DIRECTORY absl
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
++    FILES_MATCHING
++      PATTERN "*.inc"
++      PATTERN "*.h"
++  )
++endif()
diff --git a/patches/abslConfig.cmake.in b/patches/abslConfig.cmake.in
deleted file mode 100644
index 9b83fda237..0000000000
--- a/patches/abslConfig.cmake.in
+++ /dev/null
@@ -1,7 +0,0 @@
-## absl CMake configuration file
-
-set(ABSL_VERSION @PROJECT_VERSION@)
-
-@PACKAGE_INIT@
-
-include ("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
\ No newline at end of file