Fix invalid environment name escaping in Makefile
This would print 'Error: this \ environment variable must be given' previously.
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Makefile
2
Makefile
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@ -286,7 +286,7 @@ test_osdk:
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check_vdso:
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@# Checking `VDSO_LIBRARY_DIR` environment variable
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@if [ -z "$(VDSO_LIBRARY_DIR)" ]; then \
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echo "Error: the \$(VDSO_LIBRARY_DIR) environment variable must be given."; \
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echo "Error: the VDSO_LIBRARY_DIR environment variable must be given."; \
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echo " This variable points to a directory that provides Linux's vDSO files,"; \
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echo " which is required to build Asterinas. Search for VDSO_LIBRARY_DIR"; \
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echo " in Asterinas's Dockerfile for more information."; \
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