diff --git a/var/spack/repos/builtin/packages/grass/package.py b/var/spack/repos/builtin/packages/grass/package.py
index ca070112a0b8a5cc32c3ac991e21889d28e1ec8f..cc6057bf4dd7a05bae595a7dd990db93f20060f2 100644
--- a/var/spack/repos/builtin/packages/grass/package.py
+++ b/var/spack/repos/builtin/packages/grass/package.py
@@ -12,84 +12,102 @@ class Grass(AutotoolsPackage):
        used for geospatial data management and analysis, image processing,
        graphics and maps production, spatial modeling, and visualization."""
 
-    homepage = "http://grass.osgeo.org"
-
-    version('7.6.1',    sha256='9e25c99cafd16ed8f5e2dca75b5a10dc2af0568dbedf3fc39f1c5a0a9c840b0b')
-    version('7.4.4',    sha256='96a39e273103f7375a670eba94fa3e5dad2819c5c5664c9aee8f145882a94e8c')
-    version('7.4.3',    sha256='004e65693ee97fd4d5dc7ad244e3286a115dccd88964d04be61c07db6574b399')
-    version('7.4.2',    sha256='18eb19bc0aa4cd7be3f30f79ac83f9d0a29c63657f4c1b05bf4c5d5d57a8f46d')
-    version('7.4.1',    sha256='560b8669caaafa9e8dbd4bbf2b4b4bbab7dca1cc46ee828eaf26c744fe0635fc')
-    version('7.4.0',    sha256='cb6fa188e030a3a447fc5451fbe0ecbeb4069ee2fd1bf52ed8e40e9b89e293cc')
-
-    variant('cxx',       default=True,  description='Add c++ functionality')
-    variant('tiff',      default=True,  description='Add TIFF functionality')
-    variant('png',       default=True,  description='Add PNG functionality')
-    variant('postgres',  default=False, description='Add PostgreSQL functionality')
-    variant('mysql',     default=False, description='Add MySQL functionality')
-    variant('sqlite',    default=True,  description='Add SQLite functionality')
-    variant('opengl',    default=True,  description='Add OpenGL functionality')
-    variant('fftw',      default=True,  description='Add FFTW functionality')
-    variant('blas',      default=False, description='Add BLAS functionality')
-    variant('lapack',    default=False, description='Add LAPACK functionality')
-    variant('cairo',     default=True,  description='Add Cairo functionality')
-    variant('freetype',  default=True,  description='Add FreeType functionality')
-    variant('readline',  default=False, description='Add Readline functionality')
-    variant('regex',     default=True,  description='Add regex functionality')
-    variant('pthread',   default=False, description='Add POSIX threads functionality')
-    variant('openmp',    default=False, description='Add OpenMP functionality')
-    variant('opencl',    default=False, description='Add OpenCL functionality')
-    variant('bzlib',     default=False, description='Add BZIP2 functionality')
+    homepage = "https://grass.osgeo.org"
+    url      = "https://grass.osgeo.org/grass78/source/grass-7.8.0.tar.gz"
+    list_url = "https://grass.osgeo.org/download/software/sources/"
+
+    maintainers = ['adamjstewart']
+
+    version('7.8.0', sha256='4b1192294e959ffd962282344e4ff325c4472f73abe605e246a1da3beda7ccfa')
+    version('7.6.1', sha256='9e25c99cafd16ed8f5e2dca75b5a10dc2af0568dbedf3fc39f1c5a0a9c840b0b')
+    version('7.4.4', sha256='96a39e273103f7375a670eba94fa3e5dad2819c5c5664c9aee8f145882a94e8c')
+    version('7.4.3', sha256='004e65693ee97fd4d5dc7ad244e3286a115dccd88964d04be61c07db6574b399')
+    version('7.4.2', sha256='18eb19bc0aa4cd7be3f30f79ac83f9d0a29c63657f4c1b05bf4c5d5d57a8f46d')
+    version('7.4.1', sha256='560b8669caaafa9e8dbd4bbf2b4b4bbab7dca1cc46ee828eaf26c744fe0635fc')
+    version('7.4.0', sha256='cb6fa188e030a3a447fc5451fbe0ecbeb4069ee2fd1bf52ed8e40e9b89e293cc')
+
+    variant('cxx',       default=True,  description='Support C++ functionality')
+    variant('tiff',      default=False, description='Support TIFF functionality')
+    variant('png',       default=False, description='Support PNG functionality')
+    variant('postgres',  default=False, description='Support PostgreSQL functionality')
+    variant('mysql',     default=False, description='Support MySQL functionality')
+    variant('sqlite',    default=False, description='Support SQLite functionality')
+    variant('opengl',    default=False, description='Support OpenGL functionality')
+    variant('odbc',      default=False, description='Support ODBC functionality')
+    variant('fftw',      default=False, description='Support FFTW functionality')
+    variant('blas',      default=False, description='Support BLAS functionality')
+    variant('lapack',    default=False, description='Support LAPACK functionality')
+    variant('cairo',     default=False, description='Support Cairo functionality')
+    variant('freetype',  default=False, description='Support FreeType functionality')
+    variant('readline',  default=False, description='Support Readline functionality')
+    variant('regex',     default=False, description='Support regex functionality')
+    variant('pthread',   default=False, description='Support POSIX threads functionality')
+    variant('openmp',    default=False, description='Support OpenMP functionality')
+    variant('opencl',    default=False, description='Support OpenCL functionality')
+    variant('bzlib',     default=False, description='Support BZIP2 functionality')
+    variant('zstd',      default=False, description='Support Zstandard functionality')
+    variant('gdal',      default=True,  description='Enable GDAL/OGR support')
+    variant('liblas',    default=False, description='Enable libLAS support')
+    variant('wxwidgets', default=False, description='Enable wxWidgets support')
     variant('netcdf',    default=False, description='Enable NetCDF support')
-    variant('geos',      default=False, description='Geometry Engine for v.buffer')
+    variant('geos',      default=False, description='Enable GEOS support')
+    variant('x',         default=False, description='Use the X Window System')
 
-    # required components
-    depends_on('gmake@3.8.1:', type='build')
+    # http://htmlpreview.github.io/?https://github.com/OSGeo/grass/blob/master/REQUIREMENTS.html
+    # General requirements
+    depends_on('gmake@3.81:', type='build')
+    depends_on('libiconv')
     depends_on('zlib')
     depends_on('flex', type='build')
     depends_on('bison', type='build')
     depends_on('proj')
     depends_on('proj@:4', when='@:7.5')
-    depends_on('proj@:5', when='@:7.7')
-    depends_on('gdal')
-    depends_on('python@2.7:2.9', type=('build', 'run'))
-    depends_on('libx11')
-
-    # optional pieces
+    # GRASS 7.8.0 was supposed to support PROJ 6, but it still checks for
+    # share/proj/epsg, which was removed in PROJ 6
+    depends_on('proj@:5', when='@:7.8')
+    depends_on('python@2.7:', type=('build', 'run'))
+    depends_on('python@2.7:2.8', when='@:7.6', type=('build', 'run'))
+    depends_on('py-six', when='@7.8:', type=('build', 'run'))
+
+    # Optional packages
     depends_on('libtiff', when='+tiff')
     depends_on('libpng', when='+png')
     depends_on('postgresql', when='+postgres')
     depends_on('mariadb', when='+mysql')
     depends_on('sqlite', when='+sqlite')
     depends_on('gl', when='+opengl')
+    depends_on('unixodbc', when='+odbc')
     depends_on('fftw', when='+fftw')
     depends_on('blas', when='+blas')
     depends_on('lapack', when='+lapack')
-    depends_on('cairo', when='+cairo')
+    depends_on('cairo@1.5.8:', when='+cairo')
     depends_on('freetype', when='+freetype')
     depends_on('readline', when='+readline')
     depends_on('opencl', when='+opencl')
     depends_on('bzip2', when='+bzlib')
+    depends_on('zstd', when='+zstd')
+    depends_on('gdal', when='+gdal')  # required?
+    depends_on('liblas', when='+liblas')
+    depends_on('wxwidgets', when='+wxwidgets')
+    depends_on('py-wxpython@2.8.10.1:', when='+wxwidgets', type=('build', 'run'))
     depends_on('netcdf-c', when='+netcdf')
     depends_on('geos', when='+geos')
+    depends_on('libx11', when='+x')
 
     def url_for_version(self, version):
-        base = 'https://grass.osgeo.org'
-        return '{0}/grass{1}/source/grass-{2}.tar.gz'.format(
-            base, version.up_to(2).joined, version.dotted
-        )
+        url = "https://grass.osgeo.org/grass{0}/source/grass-{1}.tar.gz"
+        return url.format(version.up_to(2).joined, version)
 
+    # https://grasswiki.osgeo.org/wiki/Compile_and_Install
     def configure_args(self):
         spec = self.spec
 
         args = [
-            '--without-odbc',
             '--without-nls',
+            # TODO: add packages for these optional dependencies
             '--without-opendwg',
-            '--with-x',
-            '--with-gdal={0}/bin/gdal-config'.format(
-                spec['gdal'].prefix),
-            '--with-proj-share={0}/share/proj'.format(
-                spec['proj'].prefix),
+            '--without-pdal',
+            '--with-proj-share={0}'.format(spec['proj'].prefix.share.proj),
         ]
 
         if '+cxx' in spec:
@@ -127,6 +145,11 @@ def configure_args(self):
         else:
             args.append('--without-opengl')
 
+        if '+odbc' in spec:
+            args.append('--with-odbc')
+        else:
+            args.append('--without-odbc')
+
         if '+fftw' in spec:
             args.append('--with-fftw')
         else:
@@ -182,6 +205,29 @@ def configure_args(self):
         else:
             args.append('--without-bzlib')
 
+        if '+zstd' in spec:
+            args.append('--with-zstd')
+        else:
+            args.append('--without-zstd')
+
+        if '+gdal' in spec:
+            args.append('--with-gdal={0}/gdal-config'.format(
+                spec['gdal'].prefix.bin))
+        else:
+            args.append('--without-gdal')
+
+        if '+liblas' in spec:
+            args.append('--with-liblas={0}/liblas-config'.format(
+                spec['liblas'].prefix.bin))
+        else:
+            args.append('--without-liblas')
+
+        if '+wxwidgets' in spec:
+            args.append('--with-wxwidgets={0}/wx-config'.format(
+                spec['wxwidgets'].prefix.bin))
+        else:
+            args.append('--without-wxwidgets')
+
         if '+netcdf' in spec:
             args.append('--with-netcdf={0}/bin/nc-config'.format(
                 spec['netcdf-c'].prefix))
@@ -194,6 +240,11 @@ def configure_args(self):
         else:
             args.append('--without-geos')
 
+        if '+x' in spec:
+            args.append('--with-x')
+        else:
+            args.append('--without-x')
+
         return args
 
     # see issue: https://github.com/spack/spack/issues/11325
@@ -202,5 +253,4 @@ def configure_args(self):
     @run_after('configure')
     def fix_iconv_linking(self):
         makefile = FileFilter('include/Make/Platform.make')
-        makefile.filter(r'^ICONVLIB\s*=\s*', 'ICONVLIB = -liconv')
-        return None
+        makefile.filter(r'^ICONVLIB\s*=.*', 'ICONVLIB = -liconv')