diff --git a/mcstas-comps/examples/Tests_union/Test_inhomogenous_process/Test_inhomogenous_process.instr b/mcstas-comps/examples/Tests_union/Test_inhomogenous_process/Test_inhomogenous_process.instr
index d4e5af60e..cc075934c 100755
--- a/mcstas-comps/examples/Tests_union/Test_inhomogenous_process/Test_inhomogenous_process.instr
+++ b/mcstas-comps/examples/Tests_union/Test_inhomogenous_process/Test_inhomogenous_process.instr
@@ -180,7 +180,7 @@ COMPONENT box_sample = Incoherent(
     zdepth=thick,
     sigma_inc = 5.08,
     sigma_abs = 5.08
-) WHEN (!strcmp((const char*)"thin", (const char*)sample))
+) WHEN (!str_comp((const char*)"thin", (const char*)sample))
 AT (0, 0, 0) RELATIVE arm_sample
 ROTATED (0, 0, 0) RELATIVE arm_sample
 
diff --git a/mcstas-comps/share/tinyexpr.c b/mcstas-comps/share/tinyexpr.c
index 2a0ddfc4f..30bc63caf 100644
--- a/mcstas-comps/share/tinyexpr.c
+++ b/mcstas-comps/share/tinyexpr.c
@@ -164,7 +164,9 @@ static const te_variable functions[] = {
     {"abs", fabs,     TE_FUNCTION1 | TE_FLAG_PURE, 0},
     {"acos", acos,    TE_FUNCTION1 | TE_FLAG_PURE, 0},
     {"asin", asin,    TE_FUNCTION1 | TE_FLAG_PURE, 0},
+    #ifndef OPENACC
     {"atan", atan,    TE_FUNCTION1 | TE_FLAG_PURE, 0},
+    #endif
     {"atan2", atan2,  TE_FUNCTION2 | TE_FLAG_PURE, 0},
     {"ceil", ceil,    TE_FUNCTION1 | TE_FLAG_PURE, 0},
     {"cos", cos,      TE_FUNCTION1 | TE_FLAG_PURE, 0},