diff --git a/src/external/e57/.clang-format b/src/external/e57/.clang-format
deleted file mode 100644
index 263a8e797..000000000
--- a/src/external/e57/.clang-format
+++ /dev/null
@@ -1,108 +0,0 @@
-# libE57Format
-# Options are listed here:
-# https://clang.llvm.org/docs/ClangFormatStyleOptions.html
----
-AccessModifierOffset: -3
-AlignAfterOpenBracket: Align
-AlignConsecutiveAssignments: false
-AlignConsecutiveDeclarations: false
-AlignEscapedNewlines: Right
-AlignOperands:   true
-AlignTrailingComments: true
-AllowAllArgumentsOnNextLine: true
-AllowAllConstructorInitializersOnNextLine: true
-AllowAllParametersOfDeclarationOnNextLine: true
-AllowShortBlocksOnASingleLine: false
-AllowShortCaseLabelsOnASingleLine: false
-AllowShortFunctionsOnASingleLine: None
-AllowShortLambdasOnASingleLine: All
-AllowShortIfStatementsOnASingleLine: Never
-AllowShortLoopsOnASingleLine: false
-AlwaysBreakAfterDefinitionReturnType: None
-AlwaysBreakAfterReturnType: None
-AlwaysBreakBeforeMultilineStrings: false
-AlwaysBreakTemplateDeclarations: MultiLine
-BinPackArguments: true
-BinPackParameters: true
-BraceWrapping:   
-  AfterCaseLabel:  true
-  AfterClass:      true
-  AfterControlStatement: true
-  AfterEnum:       true
-  AfterFunction:   true
-  AfterNamespace:  true
-  AfterStruct:     true
-  AfterUnion:      true
-  AfterExternBlock: true
-  BeforeCatch:     true
-  BeforeElse:      true
-  IndentBraces:    false
-  SplitEmptyFunction: true
-  SplitEmptyRecord: true
-  SplitEmptyNamespace: true
-BreakBeforeBinaryOperators: None
-BreakBeforeBraces: Custom
-BreakBeforeInheritanceComma: false
-BreakInheritanceList: BeforeColon
-BreakBeforeTernaryOperators: true
-BreakConstructorInitializersBeforeComma: false
-BreakConstructorInitializers: AfterColon
-BreakStringLiterals: true
-ColumnLimit: 120
-CommentPragmas:  '^ IWYU pragma:'
-CompactNamespaces: false
-ConstructorInitializerAllOnOneLineOrOnePerLine: false
-ConstructorInitializerIndentWidth: 3
-ContinuationIndentWidth: 3
-Cpp11BracedListStyle: false
-DerivePointerAlignment: false
-FixNamespaceComments: false
-IncludeBlocks:   Preserve
-IncludeCategories: 
-  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
-    Priority:        2
-  - Regex:           '^(<|"(gtest|gmock|isl|json)/)'
-    Priority:        3
-  - Regex:           '.*'
-    Priority:        1
-IncludeIsMainRegex: '(Test)?$'
-IndentCaseLabels: true
-IndentPPDirectives: None
-IndentWidth:     3
-IndentWrappedFunctionNames: true
-KeepEmptyLinesAtTheStartOfBlocks: true
-Language: Cpp
-MaxEmptyLinesToKeep: 1
-NamespaceIndentation: All
-PenaltyBreakAssignment: 2
-PenaltyBreakBeforeFirstCallParameter: 19
-PenaltyBreakComment: 300
-PenaltyBreakFirstLessLess: 120
-PenaltyBreakString: 1000
-PenaltyBreakTemplateDeclaration: 10
-PenaltyExcessCharacter: 1000000
-PenaltyReturnTypeOnItsOwnLine: 1000
-PointerAlignment: Right
-ReflowComments:  true
-SortIncludes:    true
-SortUsingDeclarations: true
-SpaceAfterCStyleCast: false
-SpaceAfterLogicalNot: false
-SpaceAfterTemplateKeyword: true
-SpaceBeforeAssignmentOperators: true
-SpaceBeforeCpp11BracedList: false
-SpaceBeforeCtorInitializerColon: true
-SpaceBeforeInheritanceColon: true
-SpaceBeforeParens: ControlStatements
-SpaceBeforeRangeBasedForLoopColon: true
-SpaceInEmptyParentheses: false
-SpacesBeforeTrailingComments: 1
-SpacesInAngles:  false
-SpacesInContainerLiterals: true
-SpacesInCStyleCastParentheses: false
-SpacesInParentheses: true
-SpacesInSquareBrackets: false
-Standard:        Cpp11
-TabWidth:        3
-UseTab:          Never
-...
diff --git a/src/external/e57/.clang-format-ignore b/src/external/e57/.clang-format-ignore
deleted file mode 100644
index da7f5bcd6..000000000
--- a/src/external/e57/.clang-format-ignore
+++ /dev/null
@@ -1 +0,0 @@
-extern/*
diff --git a/src/external/e57/CMakeLists.txt b/src/external/e57/CMakeLists.txt
index 4787dc6b1..0315a57fc 100644
--- a/src/external/e57/CMakeLists.txt
+++ b/src/external/e57/CMakeLists.txt
@@ -95,8 +95,6 @@ add_subdirectory( extern/CRCpp )
 add_subdirectory( include )
 add_subdirectory( src )
 
-include( ClangFormat )
-
 # Target properties
 set_target_properties( E57Format
 	PROPERTIES
diff --git a/src/external/e57/cmake/Modules/ClangFormat.cmake b/src/external/e57/cmake/Modules/ClangFormat.cmake
deleted file mode 100644
index 6e793ecf0..000000000
--- a/src/external/e57/cmake/Modules/ClangFormat.cmake
+++ /dev/null
@@ -1,19 +0,0 @@
-# SPDX-License-Identifier: MIT
-# Copyright 2020 Andy Maloney <asmaloney@gmail.com>
-
-find_program( E57_CLANG_FORMAT_EXE NAMES clang-format )
-
-if ( E57_CLANG_FORMAT_EXE )
-    get_target_property( e57_sources ${PROJECT_NAME} SOURCES )
-
-    # Remove some files from the list
-    list( FILTER e57_sources EXCLUDE REGEX ".*/E57Export.h" )
-    list( FILTER e57_sources EXCLUDE REGEX ".*/extern/.*" )
-
-    add_custom_target( format
-        COMMAND clang-format --style=file -i ${e57_sources}
-        COMMENT "Running clang-format..."
-        COMMAND_EXPAND_LISTS
-        VERBATIM
-    )
-endif()