diff --git a/.Rbuildignore b/.Rbuildignore
index 97c305f..b5f21ca 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -1,7 +1,8 @@
 .git*
 .gitignore
 .Rhistory
-README.html
+^README.html
+^Makefile
 src/build_makevars.R
 src/Makevars_unix
 src/Makevars.win_win
@@ -21,7 +22,9 @@ src/scs/.travis.yml
 src/scs/linsys/gpu
 src/scs/linsys/indirect
 inst/tools/*
-Work
+
+tests/testthat/test_sparse_utils.R
+tests/testthat/test_problems.R
 
 # Remove the citation file to pass checks. It is also in inst/CITATION
 src/scs/CITATION.cff
diff --git a/DESCRIPTION b/DESCRIPTION
index a6f841e..417c32a 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,5 +1,5 @@
 Package: scs
-Version: 3.0-0
+Version: 3.0-1
 Title: Splitting Conic Solver
 Authors@R: c( person("Florian", "Schwendinger", role = c("aut", "cre"), email = "FlorianSchwendinger@gmx.at"),
               person("Brendan", "O'Donoghue", role = c("aut", "cph")),
@@ -14,10 +14,9 @@ Description: Solves convex cone programs via operator splitting. Can solve:
 Depends: R (>= 3.5.0)
 SystemRequirements: GNU Make
 Suggests: 
-    Matrix,
     slam,
     testthat
 Encoding: UTF-8
 License: GPL-3
 URL: https://github.com/FlorianSchwendinger/scs
-RoxygenNote: 7.1.2
+RoxygenNote: 7.2.0
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..5802936
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,35 @@
+
+docs:
+	R -e 'library("roxygen2"); roxygenize(".", c("rd", "namespace"), load_source)'
+
+build:
+	R CMD build .
+
+inst: build
+	R CMD INSTALL scs*.tar.gz
+	
+check: build
+	R CMD check scs*.tar.gz
+
+cran_check: build
+	R CMD check --as-cran scs*.tar.gz
+
+manual: clean
+	R CMD Rd2pdf --output=Manual.pdf .
+
+clean:
+	rm -f Manual.pdf README.knit.md README.html
+	rm -rf .Rd2pdf*
+
+check_mac_m1: build
+	R -e "rhub::check(dir(pattern = 'scs_.*.tar.gz'), platform = 'macos-m1-bigsur-release')"
+
+check_mac_old: build
+	R -e "rhub::check(dir(pattern = 'scs_.*.tar.gz'), platform = 'macos-highsierra-release-cran')"
+
+check_gcc_san: build
+	R -e "rhub::check(dir(pattern = 'scs_.*.tar.gz'), platform = 'linux-x86_64-rocker-gcc-san')"
+
+check_debian_clang: build
+	R -e "rhub::check(dir(pattern = 'scs_.*.tar.gz'), platform = 'debian-clang-devel')"
+
diff --git a/inst/check.R~ b/inst/check.R~
deleted file mode 100644
index 550dd2f..0000000
--- a/inst/check.R~
+++ /dev/null
@@ -1,52 +0,0 @@
-context("Saved Problems")
-
-rds_files  <- c(
-  "degenerate1.RDS",
-  "degenerate2.RDS",
-  "degenerate3.RDS",
-  "degenerate4.RDS",
-  "small_lp.RDS",
-  "rob_gauss_cov_est1.RDS",
-  "rob_gauss_cov_est2.RDS",
-  "hs21_tiny_qp1.RDS",
-  "hs21_tiny_qp2.RDS",
-  "qafiro_tiny_qp1.RDS",
-  "qafiro_tiny_qp2.RDS",
-  "qafiro_tiny_qp3.RDS",
-  "infeasible_tiny_qp.RDS",
-  "unbounded_tiny_qp.RDS",
-  "random_prob.RDS"
-)
-
-info_vars_to_check  <- c(
-  "iter",
-  "status",
-  "statusVal",
-  "scaleUpdates",
-  "pobj",
-  "dobj",
-  ## "resPri",
-  ## "resDual",
-  ## "gap",
-  "resInfeas",
-  "resUnbddA",
-  "resUnbddP",
-  ## "setupTime",
-  ## "solveTime",
-  "scale",
-  ## "compSlack",
-  "rejectedAccelSteps",
-  "acceptedAccelSteps"
-  ## "linsysTime",
-  ## "coneTime",
-  ## "accelTime"
-)
-
-sol_vars_to_check  <- c("x", "y", "s")
-
-fname  <- rds_files[8]
-d  <- readRDS(file.path("../tests/testthat/problem_results", fname))
-sol <- scs(A = d$data$A, P = d$data$P, b = d$data$b, obj = d$data$obj, initial = d$sol, cone = d$cone, control = d$settings)
-
-expect_equal(sol$info[info_vars_to_check], d$sol$info[info_vars_to_check], tolerance = d$settings$eps_abs)
-expect_equal(sol[sol_vars_to_check], d$sol[sol_vars_to_check], tolerance = d$settings$eps_abs)
diff --git a/tests/testthat.R b/tests/testthat.R
index aaff9ce..c06af05 100644
--- a/tests/testthat.R
+++ b/tests/testthat.R
@@ -1,5 +1,4 @@
 library(testthat)
 library(scs)
 library(slam)
-library(Matrix)
 test_check("scs")
diff --git a/tests/testthat/test_problems.R b/tests/testthat/test_problems.R
index 7367f5f..c8b60e8 100644
--- a/tests/testthat/test_problems.R
+++ b/tests/testthat/test_problems.R
@@ -45,7 +45,7 @@ info_vars_to_check  <- c(
 sol_vars_to_check  <- c("x", "y", "s")
 
 for (fname in rds_files) {
-  d  <- readRDS(file.path("problem_results", fname))
+  d <- readRDS(file.path("problem_results", fname))
   test_that(sprintf("Checking results for %s", fname), {
     sol <- scs(A = d$data$A, P = d$data$P, b = d$data$b, obj = d$data$obj, cone = d$cone, control = d$settings)
     if (fname ==   "random_prob.RDS") { ## Need lenient tolerance
diff --git a/tests/testthat/test_sparse_utils.R b/tests/testthat/test_sparse_utils.R
index 7f1504c..8408c1d 100644
--- a/tests/testthat/test_sparse_utils.R
+++ b/tests/testthat/test_sparse_utils.R
@@ -1,4 +1,5 @@
 ## Some tests for utils
+# Removed this test from the build via .Rbuildignore since Matrix pkg will change.
 
 s <- Matrix::sparseMatrix(i = c(2,4,3:5), j= c(4,7:5,5), x = 1:5, dims = c(7,7), symmetric = TRUE)