Make error

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From Github Actions:
```
Cloning into 'tippecanoe'...
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o geojson.o geojson.cpp
cc -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -c -o jsonpull/jsonpull.o jsonpull/jsonpull.c
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o tile.o tile.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o pool.o pool.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o mbtiles.o mbtiles.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o geometry.o geometry.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o projection.o projection.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o memfile.o memfile.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o mvt.o mvt.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o serial.o serial.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o main.o main.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o text.o text.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o dirtiles.o dirtiles.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o plugin.o plugin.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o read_json.o read_json.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o write_json.o write_json.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o geobuf.o geobuf.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o evaluator.o evaluator.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o geocsv.o geocsv.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o csv.o csv.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o geojson-loop.o geojson-loop.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o enumerate.o enumerate.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o decode.o decode.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o tile-join.o tile-join.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o unit.o unit.cpp
g++ -MMD -I/usr/local/include -I. -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -c -o jsontool.o jsontool.cpp
g++ -L/usr/local/lib -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -o tippecanoe-enumerate enumerate.o -lsqlite3
g++ -L/usr/local/lib -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -o tippecanoe-json-tool jsontool.o jsonpull/jsonpull.o csv.o text.o geojson-loop.o -lm -lz -lsqlite3 -lpthread
g++ -L/usr/local/lib -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -o tippecanoe-decode decode.o projection.o mvt.o write_json.o text.o jsonpull/jsonpull.o dirtiles.o -lm -lz -lsqlite3
g++ -L/usr/local/lib -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -o tile-join tile-join.o projection.o pool.o mbtiles.o mvt.o memfile.o dirtiles.o jsonpull/jsonpull.o text.o evaluator.o csv.o write_json.o -lm -lz -lsqlite3 -lpthread
g++ -L/usr/local/lib -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -o tippecanoe geojson.o jsonpull/jsonpull.o tile.o pool.o mbtiles.o geometry.o projection.o memfile.o mvt.o serial.o main.o text.o dirtiles.o plugin.o read_json.o write_json.o geobuf.o evaluator.o geocsv.o csv.o geojson-loop.o -lm -lz -lsqlite3 -lpthread
g++ -L/usr/local/lib -g -Wall -Wshadow -Wsign-compare -Wextra -Wunreachable-code -Wuninitialized -Wshadow -O3 -DNDEBUG -std=c++11 -o unit unit.o text.o -lm -lz -lsqlite3 -lpthread
mkdir -p /usr/local/bin
mkdir -p /usr/local/share/man/man1/
cp tippecanoe /usr/local/bin/tippecanoe
cp tippecanoe-enumerate /usr/local/bin/tippecanoe-enumerate
cp tippecanoe-decode /usr/local/bin/tippecanoe-decode
cp tippecanoe-json-tool /usr/local/bin/tippecanoe-json-tool
cp tile-join /usr/local/bin/tile-join
cp man/tippecanoe.1 /usr/local/share/man/man1//tippecanoe.1
cp: cannot create regular file '/usr/local/share/man/man1//tippecanoe.1': Permission denied
make: *** [Makefile:34: install] Error 1
Error: Process completed with exit code 2.
```

Is the double slash wrong/causing this?

Expected `cp man/tippecanoe.1 /usr/local/share/man/man1/tippecanoe.1`

Looks like makefile Ln2 has a closing `/` where it should not.

Start with Makefile line 2 and inspect the install target that copies man/tippecanoe.1 into /usr/local/share/man/man1/, comparing the generated destination with the expected path and the reported permission error. Run the installation workflow again to verify the corrected destination and successful completion.

Written by the indexing model from the issue text.