Error Building With GCC

On the newest commit to 'master', I'm now seeing an error when building with GCC (I'm on version 7.5.0). The issue seems to occur exclusively within msdf-edge-artifact-patcher.cpp on calls to memcpy.
Detailed log:
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp: In instantiation of ‘void msdfgen::msdfPatchEdgeArtifactsInner(const msdfgen::BitmapRef<float, N>&, const msdfgen::Shape&, double, const msdfgen::Vector2&, const msdfgen::Vector2&) [with ContourCombiner = msdfgen::OverlappingContourCombiner; int N = 3]’:
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:161:100:   required from here
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:134:15: error: ‘memcpy’ was not declared in this scope
         memcpy(texel, subject, N*sizeof(float));
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:146:15: error: ‘memcpy’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]
         memcpy(subject, texel, N*sizeof(float));
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:134:15: note: ‘memcpy’ declared here, later in the translation unit
         memcpy(texel, subject, N*sizeof(float));
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp: In instantiation of ‘void msdfgen::msdfPatchEdgeArtifactsInner(const msdfgen::BitmapRef<float, N>&, const msdfgen::Shape&, double, const msdfgen::Vector2&, const msdfgen::Vector2&) [with ContourCombiner = msdfgen::SimpleContourCombiner; int N = 3]’:
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:163:95:   required from here
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:134:15: error: ‘memcpy’ was not declared in this scope
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:146:15: error: ‘memcpy’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]
         memcpy(subject, texel, N*sizeof(float));
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:134:15: note: ‘memcpy’ declared here, later in the translation unit
         memcpy(texel, subject, N*sizeof(float));
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp: In instantiation of ‘void msdfgen::msdfPatchEdgeArtifactsInner(const msdfgen::BitmapRef<float, N>&, const msdfgen::Shape&, double, const msdfgen::Vector2&, const msdfgen::Vector2&) [with ContourCombiner = msdfgen::OverlappingContourCombiner; int N = 4]’:
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:168:100:   required from here
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:134:15: error: ‘memcpy’ was not declared in this scope
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:146:15: error: ‘memcpy’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]
         memcpy(subject, texel, N*sizeof(float));
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:134:15: note: ‘memcpy’ declared here, later in the translation unit
         memcpy(texel, subject, N*sizeof(float));
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp: In instantiation of ‘void msdfgen::msdfPatchEdgeArtifactsInner(const msdfgen::BitmapRef<float, N>&, const msdfgen::Shape&, double, const msdfgen::Vector2&, const msdfgen::Vector2&) [with ContourCombiner = msdfgen::SimpleContourCombiner; int N = 4]’:
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:170:95:   required from here
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:134:15: error: ‘memcpy’ was not declared in this scope
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:146:15: error: ‘memcpy’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]
         memcpy(subject, texel, N*sizeof(float));
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~/dev/msdf-atlas-gen/msdfgen/core/msdf-edge-artifact-patcher.cpp:134:15: note: ‘memcpy’ declared here, later in the translation unit
         memcpy(texel, subject, N*sizeof(float));
         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chlumsky / msdfgen

Error Building With GCC #111
