4 files changed, 25 insertions, 0 deletions
diff --git a/libcrystfel/src/dirax.c b/libcrystfel/src/dirax.c
index 1dacd021..488eb7db 100644
--- a/libcrystfel/src/dirax.c
+++ b/libcrystfel/src/dirax.c
@@ -604,6 +604,12 @@ void *dirax_prepare(IndexingMethod *indm, UnitCell *cell)
 {
 	struct dirax_private *dp;
 
+	if ( dirax_probe(cell) == NULL ) {
+		ERROR("DirAx does not appear to run properly.\n");
+		ERROR("Please check your DirAx installation.\n");
+		return NULL;
+	}
+
 	/* Flags that DirAx knows about */
 	*indm &= INDEXING_METHOD_MASK;
 
diff --git a/libcrystfel/src/felix.c b/libcrystfel/src/felix.c
index 5036ff74..cf7a38e8 100644
--- a/libcrystfel/src/felix.c
+++ b/libcrystfel/src/felix.c
@@ -653,6 +653,12 @@ void *felix_prepare(IndexingMethod *indm, UnitCell *cell, const char *options)
 {
 	struct felix_private *gp;
 
+	if ( felix_probe(cell) == NULL ) {
+		ERROR("Felix does not appear to run properly.\n");
+		ERROR("Please check your Felix installation.\n");
+		return NULL;
+	}
+
 	if ( cell == NULL ) {
 		ERROR("Felix needs a unit cell.\n");
 		return NULL;
diff --git a/libcrystfel/src/mosflm.c b/libcrystfel/src/mosflm.c
index d4034e86..14cd9d96 100644
--- a/libcrystfel/src/mosflm.c
+++ b/libcrystfel/src/mosflm.c
@@ -821,6 +821,12 @@ void *mosflm_prepare(IndexingMethod *indm, UnitCell *cell)
 {
 	struct mosflm_private *mp;
 
+	if ( mosflm_probe(cell) == NULL ) {
+		ERROR("Mosflm does not appear to run properly.\n");
+		ERROR("Please check your Mosflm installation.\n");
+		return NULL;
+	}
+
 	/* Flags that MOSFLM knows about */
 	*indm &= INDEXING_METHOD_MASK
 	       | INDEXING_USE_LATTICE_TYPE | INDEXING_USE_CELL_PARAMETERS;
diff --git a/libcrystfel/src/xds.c b/libcrystfel/src/xds.c
index a234d1e0..bd98aec4 100644
--- a/libcrystfel/src/xds.c
+++ b/libcrystfel/src/xds.c
@@ -45,6 +45,7 @@
 #include <sys/ioctl.h>
 #include <errno.h>
 
+#include "xds.h"
 #include "cell.h"
 #include "image.h"
 #include "utils.h"
@@ -596,6 +597,12 @@ void *xds_prepare(IndexingMethod *indm, UnitCell *cell)
 {
 	struct xds_private *xp;
 
+	if ( xds_probe(cell) == NULL ) {
+		ERROR("XDS does not appear to run properly.\n");
+		ERROR("Please check your XDS installation.\n");
+		return NULL;
+	}
+
 	/* Either cell,latt and cell provided, or nocell-nolatt and no cell
 	 * - complain about anything else.  Could figure this out automatically,
 	 * but we'd have to decide whether the user just forgot the cell, or