diff --git a/deps/deps-linux.cmake b/deps/deps-linux.cmake
index 9532ee2f4e..ce7b0b2b48 100644
--- a/deps/deps-linux.cmake
+++ b/deps/deps-linux.cmake
@@ -24,18 +24,6 @@ ExternalProject_Add(dep_boost
     INSTALL_COMMAND ""   # b2 does that already
 )
 
-# ExternalProject_Add(dep_libpng
-#     EXCLUDE_FROM_ALL 1
-#     URL "https://github.com/glennrp/libpng/archive/v1.6.36.tar.gz"
-#     URL_HASH SHA256=5bef5a850a9255365a2dc344671b7e9ef810de491bd479c2506ac3c337e2d84f
-#     CMAKE_ARGS
-#         -DPNG_SHARED=OFF
-#         -DPNG_TESTS=OFF
-#         -DCMAKE_INSTALL_PREFIX=${DESTDIR}/usr/local
-#         ${DEP_CMAKE_OPTS}
-#     # INSTALL_COMMAND make install "DESTDIR=${DESTDIR}"
-# )
-
 ExternalProject_Add(dep_libopenssl
     EXCLUDE_FROM_ALL 1
     URL "https://github.com/openssl/openssl/archive/OpenSSL_1_1_0g.tar.gz"
@@ -53,7 +41,7 @@ ExternalProject_Add(dep_libopenssl
 
 ExternalProject_Add(dep_libcurl
     EXCLUDE_FROM_ALL 1
-   DEPENDS dep_libopenssl
+    DEPENDS dep_libopenssl
     URL "https://curl.haxx.se/download/curl-7.58.0.tar.gz"
     URL_HASH SHA256=cc245bf9a1a42a45df491501d97d5593392a03f7b4f07b952793518d97666115
     BUILD_IN_SOURCE 1
diff --git a/deps/deps-macos.cmake b/deps/deps-macos.cmake
index 4676b14fc8..c441fc3915 100644
--- a/deps/deps-macos.cmake
+++ b/deps/deps-macos.cmake
@@ -87,20 +87,6 @@ ExternalProject_Add(dep_libcurl
     INSTALL_COMMAND make install "DESTDIR=${DESTDIR}"
 )
 
-ExternalProject_Add(dep_libpng
-    EXCLUDE_FROM_ALL 1
-    URL "https://github.com/glennrp/libpng/archive/v1.6.36.tar.gz"
-    URL_HASH SHA256=5bef5a850a9255365a2dc344671b7e9ef810de491bd479c2506ac3c337e2d84f
-    CMAKE_GENERATOR "${DEP_MSVC_GEN}"
-    CMAKE_ARGS
-        -DPNG_SHARED=OFF
-        -DPNG_TESTS=OFF
-        ${DEP_CMAKE_OPTS}
-    INSTALL_COMMAND make install "DESTDIR=${DESTDIR}"
-    INSTALL_COMMAND ""
-)
-
-
 ExternalProject_Add(dep_wxwidgets
     EXCLUDE_FROM_ALL 1
     URL "https://github.com/wxWidgets/wxWidgets/releases/download/v3.1.2/wxWidgets-3.1.2.tar.bz2"
diff --git a/deps/deps-unix-common.cmake b/deps/deps-unix-common.cmake
index 5be4f8992a..3cf843f73d 100644
--- a/deps/deps-unix-common.cmake
+++ b/deps/deps-unix-common.cmake
@@ -10,7 +10,6 @@ ExternalProject_Add(dep_tbb
         -DTBB_BUILD_TESTS=OFF
         -DCMAKE_INSTALL_PREFIX=${DESTDIR}/usr/local
         ${DEP_CMAKE_OPTS}
-    # INSTALL_COMMAND make install "DESTDIR=${DESTDIR}"
 )
 
 ExternalProject_Add(dep_gtest
@@ -18,7 +17,6 @@ ExternalProject_Add(dep_gtest
     URL "https://github.com/google/googletest/archive/release-1.8.1.tar.gz"
     URL_HASH SHA256=9bf1fe5182a604b4135edc1a425ae356c9ad15e9b23f9f12a02e80184c3a249c
     CMAKE_ARGS -DBUILD_GMOCK=OFF ${DEP_CMAKE_OPTS} -DCMAKE_INSTALL_PREFIX=${DESTDIR}/usr/local
-    # INSTALL_COMMAND make install "DESTDIR=${DESTDIR}"
 )
 
 ExternalProject_Add(dep_nlopt
@@ -33,6 +31,4 @@ ExternalProject_Add(dep_nlopt
         -DNLOPT_GUILE=OFF
         -DCMAKE_INSTALL_PREFIX=${DESTDIR}/usr/local
         ${DEP_CMAKE_OPTS}
-    # INSTALL_COMMAND make install "DESTDIR=${DESTDIR}"
-    # INSTALL_COMMAND ""
 )
diff --git a/deps/deps-windows.cmake b/deps/deps-windows.cmake
index 7276277e65..a7397316f4 100644
--- a/deps/deps-windows.cmake
+++ b/deps/deps-windows.cmake
@@ -165,46 +165,6 @@ if (${DEP_DEBUG})
 endif ()
 
 
-ExternalProject_Add(dep_libpng
-    DEPENDS dep_zlib
-    EXCLUDE_FROM_ALL 1
-    URL "https://github.com/glennrp/libpng/archive/v1.6.36.tar.gz"
-    URL_HASH SHA256=5bef5a850a9255365a2dc344671b7e9ef810de491bd479c2506ac3c337e2d84f
-    CMAKE_GENERATOR "${DEP_MSVC_GEN}"
-    CMAKE_ARGS
-        -DPNG_SHARED=OFF
-        -DPNG_TESTS=OFF
-        -DSKIP_INSTALL_FILES=ON                                   # Prevent installation of man pages et al.
-        -DCMAKE_POSITION_INDEPENDENT_CODE=ON
-        "-DCMAKE_INSTALL_PREFIX:PATH=${DESTDIR}\\usr\\local"
-    BUILD_COMMAND msbuild /P:Configuration=Release INSTALL.vcxproj
-    INSTALL_COMMAND ""
-)
-if (${DEP_DEBUG})
-    ExternalProject_Get_Property(dep_libpng BINARY_DIR)
-    ExternalProject_Add_Step(dep_libpng build_debug
-        DEPENDEES build
-        DEPENDERS install
-        COMMAND msbuild /P:Configuration=Debug INSTALL.vcxproj
-        WORKING_DIRECTORY "${BINARY_DIR}"
-    )
-endif ()
-# The following steps are unfortunately needed to remove the _static suffix on libraries
-# (And also overwrite the dynamic .lib)
-ExternalProject_Add_Step(dep_libpng fix_static
-    DEPENDEES install
-    COMMAND "${CMAKE_COMMAND}" -E rename libpng16_static.lib libpng16.lib
-    WORKING_DIRECTORY "${DESTDIR}\\usr\\local\\lib\\"
-)
-if (${DEP_DEBUG})
-    ExternalProject_Add_Step(dep_libpng fix_static_debug
-        DEPENDEES install
-        COMMAND "${CMAKE_COMMAND}" -E rename libpng16_staticd.lib libpng16d.lib
-        WORKING_DIRECTORY "${DESTDIR}\\usr\\local\\lib\\"
-    )
-endif ()
-
-
 if (${DEPS_BITS} EQUAL 32)
     set(DEP_LIBCURL_TARGET "x86")
 else ()